A school building, a place where countless students cross paths every day, slowly becomes a vast demonic hall. The accumulated human emotions—jealousy, resentment, fear, and darker impulses—crystallize into malignant spirits that lurk in classrooms, hallways, and club rooms. The manga opens with Aya, the ace and captain of her high school swim team, suddenly attacked by a vengeful water spirit. All moisture is drained from her body in an instant, leaving her mummified on the pool deck. This is only the first of many supernatural horrors that plague the campus.

Each chapter presents a self-contained terror drawn from urban legends and folk beliefs, often featuring beautiful, doe-eyed girl students as victims who encounter grotesque, deformed demons. Body horror is pervasive: bodies are twisted, drained, or mutilated in visceral ways. At the end of every story, the author provides a brief explanation of the supernatural mechanism behind the phenomenon, demystifying the logic of the curse while intensifying the sense of fatalism. There is no overarching protagonist or recurring cast; instead, the school itself is the stage on which ordinary students become prey. The stories are grounded in familiar school settings—swimming pools, art rooms, locker rooms—making the supernatural feel immediate and inescapable. The narrative arcs are episodic, each one a variation of the same grim premise: bad things simply happen to people, and no one is granted much agency or moral reprieve. The atmosphere is bleak and fatalistic, with the school portrayed as a battleground where human emotions give birth to monsters.