I saw that all the videos online are awful quality, so I'm uploading a exported DVD released in Japan in 2010 to give you a better copy. You're welcome, tumblr.
Gerard Way feat. Kyosuke Himuro — Safe and Sound
Final Fantasy VII: Advent Children soundtrack
(It was a damn crime this song was only in the Japanese releases of Final Fantasy VII: Advent Children and not internationally. I weep to think about all the folks who never got to see this video and only heard a snippet of the song in one of the trailers. Petition for part three of the remake trilogy to have this as its theme song.)
*The original uploader has upscaled the video to 4K to celebrate 15 years since their original upload.
ending theme created for Final Fantasy VII: Advent Children Complete
Oddly enough, the song was only used in the Japanese release of Advent Children Complete, with all international versions using the original "Calling" theme, even though "Safe and Sound" is presented in English, whereas "Calling" is presented in Japanese.