The main character's brother, Raika, dies suddenly. Trying to understand the cause of his death, Raika begins her own investigation. As the investigation progresses, our heroine begins to encounter obstacles... There may be circumstantial reasons concerning the brother himself... As it becomes known, the school is dominated by a cult of teenagers who rape their classmates. Was her brother really one of them? Will she be able to stop it, or will she become another victim?