Shingo, who divorced his wife several years ago, lived with his only son, Daisuke, who became a ○ school student. Worried about his son's recent decline in school grades, Shingo asks his acquaintance, Shiori, who is a teacher at ○ School, to be his tutor. One day, Shiori forgives her body under pressure from Shingo, but Daisuke catches sight of her, takes advantage of her weakness, and relentlessly rapes her. And Daisuke's behavior escalates until finally, even though his father is in the next room, he continues to be fucked in a situation where he can't speak. The 4th installment of a tanned beautiful mature woman's erotic drama that will never stop stimulating the desires of adolescents.