Hibiki is the principal of Otsuki Academy, where her daughter Iori, friend Yu, and stepson Kiyoshi—her late husband’s son from a prior marriage—work. Her husband asked her to care for Kiyoshi, so she indulges him, employing him for odd jobs. But Kiyoshi has a perverse fetish: stealing women’s underwear, from students to teachers, even Hibiki’s! Iori told Hibiki, but she couldn’t fire him. When Kiyoshi went too far, Hibiki asked Yu to find proof. Yu caught him masturbating with stolen panties. As she confronted him, a voice only Kiyoshi heard urged him to break a seal under a shelf, promising demonic power to control everything within a barrier. He obeyed, gaining mind-control powers. His first thought: fuck the beautiful nurse Shinoda he’d always desired, then his seductive stepmother and stepsister...