Girls Dead Monster- Girls Dead Monster is an all-girls band made of students from the afterlife school. Also known to their ファン as GirlDeMo, it is a sub-division and affiliation of the SSS, cooperating in certain operations.
It was formerly led によって lead vocalist Masami Iwasawa. But, after Iwasawa's disappearance, Yui became the lead vocalist. But since she has disappeared as well, the other members disappeared when they revealed that there is no one will replace Iwasawa and Yui as the lead vocalist of the band.