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Synopsis

Ichirou Tachibana's high school life takes an unsettling turn after he learns that his homeroom teacher, Yuuko Morino, practices witchcraft. When fellow student and witch Lily Ramses Futaba discovers Ichirou spying on Yuuko, Lily uses a recently acquired incantation intending to punish him. The ritual malfunctions and mutates Ichirou into a grotesque, purple tentacled entity. In this altered state, Ichirou requires sexual energy from witches to soothe the creature's appetite and to preserve fragments of his human mind. The transformation also grants him the ability to dominate the witches, forcing them to comply with his most primal impulses. As the three grapple with repeated sexual encounters and the consequences of the botched magic, they learn the spell was sold under false pretenses and crafted to deceive. Their personal crisis soon reveals ties to a larger, more malicious scheme, suggesting they are being manipulated by forces beyond their control.