In this "romantic comedy but sometime serious magical school story," life as Arata Kasuga knows it is wiped out by a bizarre incident known as "Collapse Phenomenon," which causes worldwide destruction and takes his cousin Hijiri Kasuga to the next world. To resolve the "Collapse Phenomenon" and bring back Hijiri, Arata enrolls in the Royal Biblia Academy. Waiting in the school are seven beautiful female magic users — the Trinity Seven.
Yoshitsugu Matsuoka
Yumi Hara
Ayane Sakura
Nao Toyama
Shin-ichiro Miki
Rie Murakawa
Yoko Hikasa
Aya Uchida
Chinatsu Akasaki
Ryoka Yuzuki
Aya Suzaki
Ayaka Fukuhara
Ayaka Suwa
Rie Kugimiya