Kaori Ootori belongs to the Ootori family, embroiled in a power struggle with the Kameyama family for control of Ootori Academy—a conflict underlying the school’s sinister events.

Her direct involvement begins when a masked assailant confronts her after Sena Yamamoto’s attack by tentacles and a demon. Kaori attempts to fight the assailant but fails, leading to Hitomi Kameyama’s intervention and rescue.

Supernatural elements define Ootori Academy, with its leadership implicated in demon-summoning rituals.