In the village of Kanoesaru, a mysterious series of murders occurs every sixty years, each time taking the lives of seven 17‑year‑old girls. The villagers attribute the killings to a demon that once saved the town and keep quiet about it. When the current head of the Ibuki family faces the loss of her two daughters, she summons an exorcist. The story follows the quest to uncover the truth behind the murders in Kanoesaru.