Mitsue's son Akira has an uncontrollable sexual desire and is always masturbating. His room is littered with porn videos and masturbation toys, and he indulges in masturbation whenever he has free time. Mitsue, who is crying outside his son's room, remembers Kana, who also has a very strong sexual desire. Kana consults Mitsue about her son's troubles as a sexual monster, and Kana says, "If he has such a strong sexual desire..." and she decides to confront the sex monster Akira.