For all de A.I Troopers out there who might not know: Rolling Quartz is a five member female k-rock band. Their fandom name is "Diadem". They debuted December last year with their single "Blaze".
AleXa mentioned Rolling Quartz on a livestream once and called them "really, really cool" and said she had a lot of respect for them.
For more information on them, check my pinned post!!
"We are very happy to be celebrating the 2nd Anniversary of the formation of the Rolling Quartz, and above all, we are even happier to be spending time with Diadem. We will work even harder in the future."