Saint Luminous Jogakuin

His grandfather's will leaves 17-year-old Kaihei Kijima in charge of St. Luminous Girls' Academy. Learning to oversee the school would be difficult enough, but a student's unexplained disappearance from a shower room gives his new responsibilities a far more troubling dimension.

As other girls vanish, Kaihei and his friends begin searching for a connection between the incidents. The apparent calm of the academy conceals questions that ordinary school administration cannot answer, and finding the missing students means confronting what lies beneath that reassuring surface.