Shingo, who divorced his wife several years ago, lives with his only son, Daisuke, who is a high school student. Worried about his son's recent declining grades, Shingo asks his acquaintance Shiori, who is a teacher at high school, to be his tutor. One day, Shiori is forced by Shingo to have sex with him, but Daisuke sees her and, finding her weak spot, rapes her relentlessly. Daisuke's actions escalate, and he ends up rapes her repeatedly, even though her father is in the next room, and she is forced to keep on having sex with him while unable to make a sound. This is the fourth installment of the erotic drama featuring tanned, beautiful mature women that will never cease to stimulate the desires of adolescents.