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Would you be able to do like a comprehensive summary of each season so far? It's hard finding summaries online and I wanna know what's happening but can't really afford to keep up with others :(

We're not sure exactly how detailed you were looking for out of these, but here's our shot at summarizing so you can catch up for the upcoming season 4 release newly released season 4! (It came out while we were writing this...)

These ... got way longer than we expected so they are pretty hefty synopses of the seasons!! ;;; And we still left SO much information out, but we tried to include everything that was most relevant to the main storyline. Hopefully we didn't make too many mistakes lol.

Hope this helps people catch up!

SUMMARIES OF SEASONS 1 - 3

(about 8k words under the cut)

SEASON 1

When MC first arrives in the Devildom, Mammon is assigned as their guardian but doesn't really want to participate. However, by working with Leviathan who wants his money back, MC manages to convince Mammon into making a pact with them.

That night, MC hears a voice crying out for help which leads them to a staircase, but Lucifer appears and tells them to go to bed. This happens again the next night, and they determine that they will not be able to go up unless Lucifer can be distracted away somehow.

In order to do so, MC challenges Leviathan to a TSL trivia contest so they can get a cursed TSL soundtrack that Lucifer has been wanting. Then, using a secret weapon from either Simeon or Solomon, they send Levi into a jealous rage during the contest, which Lucifer stops before Levi can kill MC. As a result, Leviathan calls MC to the planetarium later and says he recognizes them as the winner, granting them a pact with him as promised.

MC is then able to ascend the staircase to the attic, where they find someone claiming to be a human that Lucifer has imprisoned in the attic. He asks for MC to help free him, telling them that they'll need pacts with all the brothers to do so, and he suggests Beel as the next.

The next day, a tantrum by Beel over Mammon's late-night snack stealing his pudding destroys the wall between the kitchen and MC's room. As a result, MC has to stay in Beel's room for a while, during which time he starts to tell them about Belphegor and Lilith. MC then realizes that it is actually Belphegor, not a human, that is trapped in the attic, but when confronted, he merely mocks them for falling for his lie. MC storms away, but after hearing an argument between Beel, who believes Belphie is in the human realm as an exchange student, and Lucifer, who is unhappy with Belphegor for trying to stand in the way of Diavolo's dream of uniting the three realms. To try to repair the relationship between the brothers, MC decides to try to help Belphegor after all.

Luke then texts MC that he ran away from Purgatory Hall after a fight with Simeon, so Beel and MC hide him in the twins' room. However, Lucifer announces a surprise inspection. They hide Luke in the closet, but after the inspection, he is nowhere to be found. After a while of searching for him throughout the house, they discover a hidden secret room which looks exactly like Lilith's old room, and Beelzebub tells MC more about her and the Great Celestial War. However, they are interrupted when Mammon frantically calls them to the underground tomb, where Lucifer found Luke wandering with a grimoire and is furious. MC tries to protect Beel and Luke from Lucifer, who is stopped just in time by Diavolo. As a thank-you, and out of respect for MC's desire to mend things between Lucifer and Belphegor, Beelzebub then agrees to make a pact. Lucifer later apologizes to MC as well for nearly killing them.

Diavolo announces afterwards that there will be a three-day overnight trip to the Demon Lord's Castle to promote bonds between the demons, angels, and humans. On the first day, there is a castle tour, during which a witch named Helene from one of the paintings recognizes Asmodeus and angrily sucks several of the group into the painting, dropping them into an underground labyrinth below the castle. There, they find Henry 1.0, a giant snake who was formerly Levi's pet, and Solomon uses his pact with Asmodeus to amplify the latter's charming abilities into being able to tame the snake, who leads them all out.

The next day's activity is a scavenger hunt, but Asmo keeps interfering with the other teams, leading MC to state how they'd like a pact with him. He mocks them but says he'll make a pact if they can do the impossible task of taking a picture of Lucifer sleeping. That night, there is a formal dance at the castle where Lucifer threateningly asks why MC is making pacts with his brothers, but Solomon steps in to save them and temporarily lends them some of his magic out of amusement. After the dance, MC and the brothers they have pacts with try to sneak into Lucifer's room to take the picture Asmo requested, but end up back in the labyrinth instead. MC quickly manages to use Solomon's lended magic to summon Asmodeus and repeat the earlier trick of charming Henry 1.0. Asmo then becomes incredibly curious about them because they show even more power than Solomon during this incident and decides to make the pact after all.

Noticing that Lucifer is concerned about how quickly MC is gathering pacts with all his brothers, Satan declares after the trip that he will make a pact as well just to frustrate the eldest brother, leading to an argument between them. Beelzebub warns MC that they won't be able to earn Lucifer's respect by getting Satan's pact this way though, and the brothers explain how Satan was born of Lucifer's wrath after the war. MC goes to check in on Satan, but Lucifer comes and the two get into another argument, which ends with them touching a forbidden book that swaps their bodies. This worries Lucifer because he is scheduled to give a speech in front of the entire student body in a few days.

Mammon eventually suggests to MC that they use Leviathan's new game to help Lucifer and Satan make up, which would make them have to work together towards a common goal in order to get out. This turns out to be a dating sim, with MC as the heroine that everyone must try to romance. During this, MC gets various interactions with them, including seeing Lucifer act much more relaxed, which he explains is because he doesn't have to worry about disappointing Diavolo in this game world, and later, MC passes along this explanation to Satan to reassure him that Lucifer doesn't see him as a child as much as he thinks. Finally, on the final day of the game, the end confession scene actually gets interrupted by an in-game final boss of Cerberus. As the dog is about to lunge at Satan, Lucifer commands Cerberus into behaving and threatens him if he harms his brother. This begins to breed newfound respect for Lucifer in Satan, but when they return to the real world after finishing the game, their bodies are still swapped.

A few days later, they still have not swapped back, so Lucifer, Mammon, Satan, and MC go up to the human realm to find the witch who originally created the body swap curse to have her reverse it. However, on the train ride to meet her, she is murdered, and Mammon is blamed as her killer. At her ghost's behest, Satan and MC solve the murder to clear his name and find the true killer. She then lifts the curse as thanks, but speaking to MC one-on-one, she notes that although Lucifer trusts them now, they will soon break that trust.

Back in the Devildom, all the brothers except Levi celebrate at a dinner with Diavolo. MC asks Diavolo how they were chosen for the exchange program, but he explains that Lucifer was the one to actually pick them. On the way home from dinner, Lucifer gets a frantic call from Leviathan, but the latter disappears with a scream just as he picks up. The brothers then all split up to try to find him in the house, during which Satan pauses to make a pact with MC, this time out of actual respect. However, all the other brothers start disappearing as well, leaving only MC and Lucifer. They come to the conclusion that this is also Levi's newest game taking over the house and that they must complete the game to bring back the other brothers, which means MC must romance Lucifer.

However, while asking each other questions to get closer, MC decides to confront him about having met Belphegor, which enrages Lucifer. The other brothers suddenly enter, having overheard about Belphegor, which then makes Beelzebub very angry. The whole scene is then interrupted by the appearance of Belphegor himself. Angry at Lucifer for the whole situation, Beelzebub leads MC and Belphegor away, and they go to stay at Purgatory Hall instead.

There, Beel tries to get more information from his twin about why Lucifer locked him away in the attic in the first place, when Diavolo appears. He explains that Belphie had tried to appeal to stop the exchange program because of his hatred of humans and threatened to kill all humans in an effort to prevent it, leading Lucifer to lock him away for his own protection. Belphegor then protests it being framed as sheltering him, but Diavolo clarifies that it was to shelter Belphegor from him, as his threat against humans amounted to treason against Diavolo's goals. As a result, Lucifer has now been placed under house arrest, and Belphegor is taken away to face justice.

With Belphie gone, Beelzebub and MC return to the House of Lamentation, where MC apologizes to each of the brothers in turn for deceiving them about their goals in making the pacts, except for Lucifer who has locked himself away in his room. They all then go back to the underground tomb so that MC can use the grimoire to try to get Lucifer out of his room, but upon touching the book, which is held by a statue of Lilith, they see a flashback of Lucifer pledging loyalty to Diavolo after falling from the war in order to save a dying Lilith. Lucifer arrives and explains that Belphegor's hatred of humans was because he blamed them for Lilith's death.

The brothers then further explain the background of the Great Celestial War, with Lucifer explaining that although there were other reasons, Lilith being sentenced to oblivion after giving her human lover a Celestial Realm fruit to save his life was the catalyst for his rebellion. He further explains that he pledged his loyalty to Diavolo in exchange for the demon prince saving his sister's life by having her reborn as a human. Armed with this new knowledge, they all decide to go appeal to Diavolo to release Belphegor. Diavolo agrees, but only on the condition that MC travel back in time to figure out exactly who released Belphegor, since MC had not actually succeeded in making the pact with Lucifer.

Barbatos sends MC through a portal back to the past, to when the brothers were disappearing, which is revealed to have been a trick on their part to try to get Lucifer and MC to make up. Not realizing that this is not the MC of their own timeline, the brothers send them back to Lucifer, but they quickly hide in the secret room when they almost run into Lucifer and their past self. However, in doing so, MC again sees Lilith's memories, and with those in mind, they go back up to the attic and touch the door to Belphie's room, which magically opens. Realizing that he is now free, however, Belphegor laughs at them for falling into his trap and attacks them, as he is still set on eradicating humans. MC faints but meets Lilith in their dream, who lends them her power to save her brothers and heals them.

From there, MC goes back downstairs and sees the brothers arguing, as well as the mangled body of MC from this timeline. Determined to kill MC, Belphegor again prepares to attack them but is stopped by the story of Lilith. Lucifer asks where MC heard this story, when Diavolo and Barbatos appear, revealing that MC is actually a distant descendant of the human that Lilith was reborn as. At last, Belphegor reveals that he blames himself for Lilith's death, and Lucifer admits to everyone that he should have told them sooner. Barbatos then uses his powers to collapse the timeline and makes this the sole "true" reality.

With all resolved, time moves ahead to the brothers preparing for Diavolo's upcoming birthday. Belphegor notices how wary all the other brothers are of him, however, which leads to MC aiding him in making amends with the others as they go about selecting gifts. When it comes to making up with Lucifer, the eldest then leads them back to the secret room and offers to let Belphegor use it whenever he misses her, much as he himself had long used it to unload the burden of the secret about her rebirth. Belphie declines, however, saying he wants to move forward.

The brothers all then attend Diavolo's birthday, where it is revealed that MC is the guest of honor. MC finds Belphegor outside at the party, where he remarks that they seem happy with the other brothers' gifts, which were actually for them. He doesn't have a gift for them but decides to give himself, in the form of making a pact with MC as well.

After another time skip, Lucifer notes that there is only one week left of MC's year-long stay in the Devildom. The brothers are all upset over this, but MC gradually spends time with each of them over the course of the week to placate them and prepare their goodbyes. Diavolo notes that Lucifer also seems distraught over their leaving, and on the final night, MC enters the eldest's secret study, where he offers up his pact as well. Finally, everyone gathers in the student council room as the exchange students all return to their realms, and MC says goodbye to everyone.

A while later, the demons are shown talking about how they miss MC and the other exchange students, and the season ends with the brothers discovering that Belphegor has regularly been having phone calls with MC since they left.

SEASON 2

The season starts off with a strange scene -- the background shakes and blurs while Solomon is talking to MC with a serious look on his face, telling them that they have to act and take a dagger and stab it through someone's chest.

The scene fades away and MC is back to their senses in the human world, getting a call from Mammon. He has to hang up soon though to go to a meeting -- and the moment he does, MC gets a text from Solomon, asking how they are doing. To their surprise, he appears before them and says that they're going back to the Devildom, because MC misses it don't they? Without being able to say anything, both MC and Solomon suddenly drop into the RAD Student Council Room, where Diavolo and the brothers were in the middle of a government meeting. They're all shocked and excited to see MC, welcoming the surprise of them returning to the Devildom!!

Solomon walks MC to the House of Lamentation while the brothers finish up their official business, and then he himself says he's going to go check out Purgatory Hall. The brothers come home, not able to contain their excitement, and eagerly make dinner for MC -- whatever cuisine they want!

This, however, leads to Mammon adding a "secret ingredient" to the soup, which turns out to be Golden Newt Hellfire Syrup, a special syrup that Leviathan had ordered. Turns out this syrup is a powerful aphrodisiac for demons, and makes them really horny towards humans and humans exclusively. The only way known to stop the effects of the syrup is that, if a demon has a pact with a human, the human can command them to do something. If the demon is given an order -- any order -- the syrup's effect is neutralized. Cue a whole section dedicated to brother-by-brother dealing with this. Truly, straight out of a fanfic.

After that whole ordeal, MC gets a text from Simeon, inviting them to visit the Celestial Realm. After some discussion of the brothers wanting to go too and Lucifer reminding them that they probably wouldn't be welcome, MC and Solomon both go make a trip to see Simeon and Luke in the Celestial Realm. The angels mention that Michael actually wanted to meet MC, but couldn't because they got news of a sacred spring in the eastern part of the realm was starting to dry out and Michael had rushed to investigate. It's then mentioned that Simeon and Luke are going back to the Devildom as part of a short-term program, which the elder angel just sort of forgot to tell his companion, and they all return to the Devildom together.

There is then a series of events which include one of Leviathan's 3D escape room games causing a headache for everyone. During one of these moments, MC can notice that Diavolo seems to have something weighing on his mind, but he asks MC to forget about anything he said and move on.

Diavolo appoints MC as head of the school festival committee, and they all eventually agree on putting on a play for the festival. This is also when it's revealed to Leviathan that the author of his beloved series TSL is no other than Simeon -- as Satan had suggested to ask Simeon to write the script for the play. The play gets approved and they go on with play preparations, which includes having to go and shop for costumes/props.

During the shopping trip, they run into Little D No. 2, who got lost/separated from Diavolo and Lucifer. They had gone to the carnival Devil's Coast to investigate an illegal casino (that Mammon is aware of) and now MC and Mammon are asked to help reunite No. 2 with Diavolo and Lucifer. A series of events happens at the carnival, and eventually everyone shows up there. Lucifer and MC have a moment together where Lucifer confesses that Diavolo has been acting strange/distant lately, to which MC helps encourage him to just ask Diavolo directly about it.

Fast-forward to later in the night at the carnival, and Beelzebub goes on a rampage at the Ghost's Cafe as they're not giving him more food. A whole fight breaks out with all the brothers and the staff, which MC steps in to stop by using their pacts to command all the brothers to stop. Their simple command of "Stay!" suddenly has all the brothers flat on the ground, much to their surprise. After this incident, the brothers are mumbling about how strong MC was to command all seven of them at the same time and with such a force.

After this incident, MC is asked several times by different people if they are feeling okay. MC responds that they're fine. Solomon is surprised that MC seems to be perfectly okay after controlling the Seven Demon Lords all at once, as he remembers how sore he was after the first few times he controlled demons.

Fast-forward after a series of events involving the brothers fighting with each other again and intense rehearsals under the very strict director Simeon, Diavolo suddenly gets called to attend to an urgent matter via a whispered message from Barbatos. Lucifer is ready to accompany him, but Diavolo tells Lucifer to not come, and instead invites Solomon. Both Lucifer and Solomon are surprised by this, but Diavolo leaves with the sorcerer without much more explanation. Lucifer is shocked and bothered by this, and later admits to MC that he has a feeling something bad is happening. Diavolo ends up dropping out of the play because he won't be able to make it back in time for the performance the next day, and so Simeon has gone ahead and rewritten the scenes and they'll be able to perform still as they rehearsed.

The play is put on to much success, which ends in a scene where MC as the protagonist decides to kill themself with a dagger instead of killing the princess that their beloved (Prince Lucifer) is set to marry. Important to remember for later.

Later, an unscheduled student council meeting is called. Diavolo announces that while the pass/fail line for exchange students is usually lowered to give them more leeway, that will be changing for MC. MC will now be expected to pass RAD exams at the same level as demons, with the reason being that if they are to control demons themself, they need to know as much as possible. Lucifer assigns Satan to be MC's tutor, and then there is a series of tutoring-time-with-Satan (and others) scenes. MC eventually passes the exams and all is well!

Cue Bloody Moon time, a phenomena that happens now and then in the Devildom which includes a popularity contest held at RAD. Asmodeus is determined to make it to the top, even though Diavolo and Lucifer always hold the top two spots. MC helps Asmo out and there is a whole arc with him and helping him with the contest.

Diavolo drops out of the competition and still hasn't told Lucifer what's going on, much to Lucifer's dismay. Simeon notes to Luke and MC that Solomon has been going in and out of the Demon Lord's Castle a lot lately.

At some point in all of this, Simeon also visits the castle, bringing a cake that Michael chose himself from the Celestial Realm. Simeon and Diavolo share some small talk, before Simeon tries to ask what Diavolo has been up to. The two get into a tense discussion, Diavolo airing his frustrations with angels and not being able to keep themselves out of Devildom business, which Simeon responds to by saying the Celestial Realm only does so when they think they are also affected. They couldn't care less what happens in the Devildom as long as it stays there -- and basically delivers a thinly-veiled threat message from Michael, saying that if this "business" is likely to affect the Celestial Realm in anyway, they won't hesitate to intervene.

Meanwhile, increasingly distressed about this whole situation, Lucifer asks Mammon to spy on Diavolo and Solomon using Mammon's crow familiars. The crows tell them that they went to the King's Tomb, which had collapsed. There was also a major landslide in the primeval forest, where an entire cliff face crumbled away. Lucifer asks Mammon to continue looking into it.

At the primeval forest, Diavolo, Barbatos, and Solomon are investigating. Solomon insists that Diavolo should tell Lucifer what's going on, but Diavolo continues to be cautious and insists that he doesn't want to stress Lucifer out/put a burden on him, especially since they're not 100% sure why these events are happening. Solomon then says that he should at least tell Simeon so that the Celestial Realm is clued in, to which Diavolo lightly grimaces and tells Solomon to first tell Simeon himself.

Back to the brothers, and they get into another mess of shenanigans to yet another one of Levi's games, where a curse was invoked when he tried to play a game before its release day. The curse can only be broken if whatever the person was wishing for at the time they opened the game comes true -- but Leviathan doesn't know which wish of the brothers needs to be granted. Cue MC and Leviathan going through a series of brother-by-brother moments granting their wishes. Beel's wish was to have a Devildom cocktail drink called the Siren's Song, which involves playing the song of a siren, which they manage to deal with by blocking their ears. After the curse is broken, it turns out that Beelzebub wanted a second Siren's Song but messed up and had to fight against the siren's call -- and in that attempt, thrashed about and messed with Lucifer's records -- breaking one of them in particular, the Hymn of the Reaper. Breaking the cursed record incurs the reaper's wrath, meaning that the reaper may shorten or end Beelzebub's life.

Solomon happened to visit the House of Lamentation during this, and takes everyone to the reaper's cave -- the reaper being a good friend of his (who we now know as Thirteen), he says, despite the reaper leaving a warning written in blood outside the cave for Solomon to not step a foot inside. The gang has to survive a series of traps in the reaper's cave to get to the end and see if they can break Beelzebub's curse.

During one of the traps, MC notices that Solomon seems to take something from one of the rooms, but he denies it and moves on. After eventually surviving the various traps, they come to the cave that holds everyone's life candles -- and Beelzebub's is burning much faster than everyone's else. Lucifer takes his candle and drips some of the life essence wax onto Beel's, saying that with their long lives, he has more than enough to spare to make Beelzebub's last longer. The other brothers join in, adding to Beelzebub's candle. However, the candle is still burning quickly.

MC insists on adding a drop from their candle as well, which everyone tries to stop as human lives are much shorter and it's a bigger deal if MC does so. MC doesn't listen and adds a drop to Beelzebub's candle -- and suddenly a flash of light happens and Beelzebub's candle is back to normal.

While this is all happening, Diavolo and Simeon are now at the primeval forest as Diavolo fills Simeon in on what's been going on. Solomon has given his theory that MC is the reason all of these things are happening, and Simeon asks why Diavolo hasn't told Lucifer about all of this. Diavolo insists that they don't know if MC is really the cause, and he doesn't want to burden him and the brothers since MC is very important to them. However, Simeon and Barbatos both push Diavolo to tell Lucifer, and he relents and says he'll go to Lucifer and tell him everything face-to-face.

The brothers + MC + Solomon return to the House of Lamentation, still not clear on what exactly happened. Solomon is about to tell MC something when Lucifer collapses/faints, sending everyone into a panic. Solomon says he'll get the others, and soon the entire cast is at the House of Lamentation. Lucifer is still unconscious.

Diavolo tells everyone that strange things have been happening in the Three Realms. Solomon had noticed that ancient sites and those associated with the Devildom/Celestial Realm in the human world had been crumbling or were being destabilized (earthquakes, volcanoes, etc.), the Devildom was experiencing the same, and so was the Celestial Realm though to a lesser degree (remember the dried out sacred spring?). It turns out this is the reason Solomon brought MC back to the Devildom in the first place -- as he figured it had to do with them and wanted to test out his hypothesis. Turns out he was right!

Before they can further explain why MC is the cause of it, Luke runs in saying that Lucifer has woken up. Everyone rushes to see him -- only to find that he has amnesia and doesn't remember who anyone is. They realize that Lucifer's amnesia was likely also caused by this strange phenomena, which is all a result of the strange connection MC shares with all three realms. They refer to this as the "ring", and have to figure out how to stop it from basically destroying everything.

The options are limited -- the Ring of Light is the optimal solution, and it was Lucifer's ring before the Great Celestial War. It is essentially the equivalent to Solomon's Ring of Wisdom that he received from Michael. However, the ring was lost during the war and never recovered, so that isn't an option. Simeon takes note of this.

Solomon reveals that he did indeed take something from the reaper's cave -- the Night Dagger. MC will have to sever all of their pacts to bring stability to the Three Realms again since there is no other way of containing their powerful magic. Solomon has to research on how exactly to use the dagger and goes to do so.

Meanwhile, there are scenes with amnesia!Lucifer and brother bonding time as they all get to see a different side to Lucifer -- his more rough, open self that he usually hides. The brothers are also sad about having to end their pacts with MC, but all assure MC that nothing will change about their relationship otherwise.

Solomon eventually comes back to the House to talk to MC about how the Night Dagger will work. Remember that scene from the beginning of the season? It was a vision of this scene! Solomon says that the Night Dagger's power is depleted, and the only way to restore it is to kill a very powerful demon with it.

The demon in question? Lucifer.

However, Solomon then quickly says he could never actually ask MC to do something like that. He cares too much about MC and while he would do it in their place as the human realm's safety comes first, he couldn't bear to do something that would hurt MC. He'll try to find another way, even though all his efforts thus far have been fruitless. Lucifer interrupts, having heard the conversation, and orders Solomon to leave. Solomon resists at first, but then leaves and says he'll come back with Diavolo and Barbatos the next day to talk further.

Once Solomon is gone, Lucifer tells MC that while he doesn't have all his memories, he is certain of one thing -- that he cares deeply for MC and his brothers. He is willing to sacrifice his life if it means that everyone else will be safe, and tells MC to go ahead and stab him with the dagger. While MC resists, Lucifer guides their hands to position the dagger at his chest. Lucifer remarks that this scene seems familiar somehow ... did they perform it in a play or something? If that's the case, MC just needs to do what they did then. MC is then given the option to stab Lucifer, stab themself, or tell Lucifer to "Stay!" as he guides the dagger to his heart.

Thankfully, any stabbing is interrupted by a flash of light -- Simeon has appeared, and slips a ring onto MC's finger. Lucifer's Ring of Light, which immediately works to get MC's magic/power contained. MC has a moment talking to a faceless voice, who is presumably Michael. Michael notes that he's surprised how much the demons care for MC, and asks MC about their choice earlier with who they stabbed. He says he looks forward to learning more about MC, and then MC regains consciousness. Lucifer is back to normal, his memories returned and panicking over MC, and everyone is relieved that they were able to stop things from getting worse.

We find out then that Simeon had a suspicion that Michael had in fact retrieved the Ring of Light after the war and kept it away (along with his other Lucifer memorabilia). Simeon actually returned to the Celstial Realm and ended up taking the ring without Michael's permission. Michael warns Simeon over text that they need to have a serious conversation, though Simeon sasses him back saying the ring was Lucifer's in the first place.

All is well! (Except for the fact that Lucifer is furious that Diavolo and Solomon didn't tell him anything, and ends up punishing them both for it -- yes, Lucifer does in fact string Diavolo up from the ceiling, along with Solomon!)

Afterwards, there is a party at the Demon Lord's Castle. There, Solomon asks MC if they would be willing to now become his apprentice, to which MC agrees. Solomon is delighted to have a fellow powerful sorcerer by his side. MC's time in the Devildom is coming to a close, and Solomon says that if MC wants to learn to summon the demons to the human world, they have to get something of importance from each of them. Cue a series of scenes with the brothers to get those items. During all of this, the brothers also comment that Lucifer has been making them do various things -- cleaning up rooms, giving away items, clearing up debts -- but they're not sure why.

Despite all this, the brothers really don't want MC to leave ... so they try kidnapping MC and sneaking away through a secret passageway through the Underground Tomb. Their plans are foiled as they emerge from the passage -- Diavolo and Barbatos are waiting, having predicted that the brothers would do exactly this. Diavolo says that he needs MC to return to the human world and learn from Solomon to help guard the human world and work towards his goal of peace between the Three Realms.

Everyone sadly accepts that MC must leave, and they all give their heartfelt goodbyes as Barbatos opens a portal to the human world.

SEASON 3

MC has been training for a while under Solomon in the human realm now. One day, he says he has a babysitting job for them, and gives the address. MC shows up at quite the fancy manor, and goes to the door -- only to be surprised when Asmodeus answers, slamming the door right back in his face in shock. Turns out that the demon brothers are up in the human world on extended vacation, and that's why Lucifer had them cleaning up as they would be in the human world for a bit. They welcome MC to their home, Serenity Manor, where they had Barbatos set up portals that make it so they basically still have their Devildom rooms -- including MC's. MC basically moves in to Serenity Manor for the time that the demons are in the human world.

Everyone's reunited, happy times, and MC goes around with the brothers a bit in the human world. MC also bumps into Luke, and finds out that both Simeon and Luke were sent by Michael on a mission to observe the human world. To do so, they opened a cafe called the Angel's Halo. During this time, there is a discussion about angels and their ranks, and it is revealed that Simeon's rank is currently an archangel, while Luke is unranked and would like to be a principality some day.

Fast forward a few events, and MC finds themself suffering from a side-effect of Solomon's cooking (which had everyone else very sick for some time as well). Asmodeus is also affected, and the both of them end up passing out -- only for MC to wake up to an Angel!Asmodeus in the Celestial Realm. MC is very confused, and ends up meeting the brothers as angels one by one with the exception of Lucifer, who is apparently on an official diplomatic visit to the Devildom at the time. This is also when MC first hears of Raphael, as Asmodeus complains about him and has to make sure that MC is not with him. The brothers all think MC must be some low-ranking angel that got lost, and if MC mentions that they know Simeon, they're surprised that MC knows a seraph. In the middle of a conversation, there is a flash of light and MC faces the white void with a mysterious voice -- once again, presumably Michael. He apologizes and says that Solomon's cooking somehow launched MC back in time, but they would be returning to the present again. Michael makes a mention that while Solomon has a good head on his shoulders, this is how he ended up accidentally making himself immortal too.

MC wakes back up in Asmodeus' room, who also wakes up. He mentions he had a strange dream, but otherwise MC does not discuss what happened. A few more brother moments happen, and MC finds out one morning that they're to be meeting up with Solomon.

Solomon brings MC, along with Beelzebub and Lucifer, to the Sorcerer's Society. It turns out that Solomon and the Sorcerer's Society are not on good terms, but having Lucifer and Beel there helps give MC some credibility as they go to register for a license to start using more magic within the human realm. However, this requires them to be awarded 7 stars -- each representing one of the Seven Heavenly Virtues. Solomon begins the first test immediately by shrinking Lucifer to handheld size and telling MC that they must utilize Beelzebub's full power to keep him protected. Beel initially doesn't expect it to be a problem if they just bring him safely home, but Lucifer points out that he lives with his biggest threats who would most like to do him harm -- his brothers, a point which is quickly proven true by the other brothers dropping them immediately into an RPG upon their return with Satan as the antagonist. Nonetheless, MC is able to harness Beel's powers through various trials to complete the game, as well as win their first star from Solomon, who totally knew about the RPG plan and made himself the actual final boss.

Next, Diavolo goes missing from a Barbatos portal gone awry, but Levi's recent new "friend," a smart home speaker assistant named Crowe, helps MC and the brothers find him at a karaoke room. However, the karaoke room, which is also controlled by a Crowe (and the Three-Legged Crow group, a Devildom company that also made the D.D.D.s), is cursed so that no one can leave until someone completes a song with a perfect score, and all other attempts end in them getting sent to a mysterious "punishment room." The brothers take turns attempting but all except Leviathan fail for one reason or another, until Diavolo successfully completes his song. However, he also gets sent to the punishment room and none of the earlier brothers are freed, leaving only Levi and MC free to leave. Levi, angry at the perceived betrayal of his electronic little friend, demands that Crowe free everyone if they succeed on the next song, and he and MC successfully save everyone by singing an anime song as a duet. The experience fosters a new friendship between Levi and Diavolo, and MC earns their second star from the demon prince as well. Following this ordeal, Diavolo and Barbatos also travel up to the human realm for a more extended stay, with Diavolo being revealed as the owner of a deluxe hotel company.

Next up, Luke, Mammon, and MC read about fairies and want to try to find some. While reading up about the fairies, MC has a discussion with Luke, who is shown to not really know what the Great Celestial War was actually about, but he mentions that Michael seems to still miss the brothers a lot. Wanting to mend things for Michael's sake, he asserts that whatever the brothers did, he's sure Michael would forgive them if they just apologized. They continue their research, and find a possible location to find some fairies. To get there, they take a long train ride together, during which Mammon teases the young angel relentlessly and takes it a bit too far. He then explains to MC that Michael must have very high expectations of Luke, talking about how Michael probably wants Luke to expand his worldview which includes understanding demons. After getting off the train, Luke gives MC his blessing as protection, and the group makes their way through a forest to try to find the fairies, only to instead come across what appears to be the House of Lamentation.

Soon after entering, however, MC gets separated from the two of them, but then gets a call from Satan. MC mentions what's happening, and soon after both Satan and Simeon suddenly appear via portal (courtesy of Barbatos). Suddenly, they are transported to what appears to be the Celestial Realm of the past, back when the brothers were still angels and Simeon was still a seraph. Simeon tells the brothers that MC and Satan are simply some lost angels. There is a series of events with the angel brothers, and then an outburst from Satan which leads both Satan and MC to leave the others -- and run into angel Lucifer. Satan and MC say that they are both angels that are with Simeon when he questions who they are. Lucifer then says if they are a seraph's assistants, they can help him out with a task that Raphael threw at him to do. Satan and MC help Lucifer with organizing the Celestial Palace's library, which leads Lucifer to comment on how nice it would be to have a brother like him. There is then a brief moment where Lucifer tricks Satan into opening a book that restrains him -- confirming that Satan and MC are in fact not angels, and that Satan is a demon. However, he soon releases Satan, admitting that while he once thought all demons were awful and terrible, a certain demon (Diavolo) has been making him reconsider things. He invites Satan and MC to join him as he meets up with the other brothers.

The brothers then get together at a fake planetarium that Michael had constructed to stargaze , which Satan had always previously felt left out from because of how the brothers would talk about their Celestial Realm days when they did so. Afterwards, they are returned to the present and reunite with Mammon and Luke, revealing that the whole experience since entering the forest was an illusion created by the fairies because they liked the hawthorn berry powder that covered Satan from a mishap at the Angel's Halo before they arrived. Oh the way back, Simeon reflects on how those times before the brothers fell were the happiest of his life, and how lonely he's felt since. MC then receives two more stars, one from each angel.

For MC's next star, Solomon poses a test of a game of Tail Thieves, in which MC, Barbatos, and the brothers all have tails which they must try to pull off of each other. Solomon tells MC that they must retrieve the tails from everyone else, but that Asmodeus and Barbatos will be on a team with them to help them with this task, and as part of that, he lends MC Barbatos's grimoire, which they further explain contains all details of a demon's life. However, Barbatos asks MC to please refrain from using his grimoire as he's not comfortable enough with them to offer that trust, but he assures them that he will be very useful even without it. Asmodeus, for his part, keeps pressuring MC to open the grimoire to find out all of Barbatos' secrets. The three of them go around gathering tails from everyone, and at one point, Asmo runs off for skincare, leaving MC with an opportunity to chat briefly with Barbatos one-on-one. After gathering the last of the brothers' tails, MC is relaxing with Asmo and Barbatos, but they reveal that they weren't truly on MC's team after all and promptly pull MC's tail off. However, when Solomon returns, he says that the test was not actually about the game but about resisting the temptation to use or look through Barbatos's grimoire, so they pass.

A few days later, MC is invited to spend the day at an amusement park with Diavolo, but Beel is worried about Belphie, who has been just staying home sleeping even more than usual, and asks MC to take him along too. On their way, Belphie sees Simeon meeting with someone who looks familiar, though he doesn't say who. Separately, Barbatos makes a delivery to the cafe and chats with Luke, when the young angel expresses concern over how Simeon has been zoning out lately and seems to be avoiding Michael. He further explains that it was actually Raphael, not Michael, who instructed them to go to the human realm.

Once MC and Belphegor arrive, Diavolo is excited to see and do all sorts of things, but Belphegor, still bitter over not being heard out on the exchange program, accuses him of being selfish and not caring about the feelings or opinions of others. Upon hearing this, Diavolo feels guilty and hears him out, and they go to what Belphie wants to do instead, which is a scary ride that overwhelms Diavolo a bit. MC and Belphie then get separated from the prince and look for him, though Belphie wants to relax instead. Eventually, they are called by the front desk to get Diavolo, at which time they learn he was actually kidnapped and is being held hostage, though he seems very cheerful about the whole thing. However, when the kidnappers try to shoot at Belphie, Diavolo gets much more serious because they are now threatening a precious member of his realm, even if bullets don't do anything to demons. The kidnapper flees in terror at both Belphie's and Diavolo's demon forms, and crisis is averted. Afterwards, they continue having fun at the amusement park for the rest of the day, with Belphegor finally relenting at the end to do some of the more silly fun things that Diavolo had wanted to do, which he had initially rejected at the start of the day. They all head back to Serenity Manor for dinner, the brothers noticing the better relation between Diavolo and Belphegor, and MC then receives their sixth star.

Later one morning, Lucifer receives a call from Barbatos to bring all the brothers to the hotel, and Simeon and Solomon happen along as well. It turns out that Mammon and Levi accidentally summoned a bogeyman, a fearsome spirit which takes the form of one's greatest fear, and sent it to the hotel in a panic to try to get rid of it. As a result, it is now wreaking havoc in the hotel. Solomon decides that this is a good chance for MC's final test and sends them to defeat it, offering up Simeon to help. Simeon also mentions that while Luke himself is seemingly unaware of it, he is actually extraordinarily powerful, and his blessing still protects MC even now, meaning that the boogeyman's tricks don't work on MC.

Together, they all go through multiple rounds of facing the bogeyman with different brothers' fears. Finally, when Satan comes face-to-face with a taunting angel Lucifer that preys on his insecurities, MC and the actual Lucifer snap him out of it, helping him overcome his inferiority/clone complex so that MC can use Satan's powers to attack and seemingly defeat the bogeyman. Mostly everyone leaves to chase Mammon and Leviathan for putting them in this situation, but the bogeyman attacks one more time when only Lucifer, Simeon, and MC are in the room, taking the form of a light, which is seemingly God/Father. Lucifer claims that this must be the boogeyman showing his fear and instructs MC to harness his power to finish off the bogeyman once and for all. Afterwards, however, Simeon seems visibly shaken from seeing Father and says he hasn't seen that light in a very long time.

MC is then given the final star needed for their sorcerer's license, and there is a big celebration party. During this party, MC overhears a conversation between Lucifer and Simeon -- with Simeon insisting that the boogeyman was actually showing his fear, not Lucifer's, earlier. Lucifer notices MC is there, and they drop the subject.

The brothers also must soon prepare to return to the Devildom. They decide to throw a "see you again" party, with the brothers all talking about how MC is part of the family now as they prepare for the celebration and talking about how much they will miss them. At the party, they decide to ask Diavolo if MC can actually join their family via marriage, with some bickering over who would actually get to marry them. Though amused, Diavolo says it's not that simple unfortunately, as there is a deep history of tensions and conflict between the realms. Nevertheless, MC will continue their magical training under Solomon, which will eventually allow them to learn more advanced magic such as how to teleport to the Devildom or summon the brothers up to the human world. Promising that this is not their final goodbye, the demons all return to the Devildom for the start of another school year at RAD.

However, upon returning, there is a letter from Michael announcing who the next exchange students will be, and Diavolo calls Lucifer over with some grave news he's received concerning Simeon. Simeon, meanwhile, receives a surprise visit at the cafe from the snide seraph Raphael...

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