​The Kameyama and Otori families, who are related, engage in a fierce battle for dominance at Otori Academy. However, the school becomes plagued by violent crimes, with female students falling victim to a mysterious assailant donning an iron mask. Senna experiences a terrifying encounter with tentacles that assault and violate her, courtesy of a demonic entity. Just as Mao finds herself face to face with the enigmatic man in the iron mask, her attempts to fight back prove futile. Luckily, Hitomi Kameyama comes to her rescue. Brace yourself for an unfolding tale of horror as startling revelations and unspeakable horrors await everyone involved.​