Gibojiri: Musuko ga shitai yoru (2002)

Yoshino and Takashi have both remarried and have children. Since Yoshino came to live with them, Takashi's son, Shunichi, has neglected school and has been peeking into Yoshino's bedroom and bathroom. Even when he embraces his girlfriend, Hiyori, all he can think about is Yoshino. Filled with desire, he embraces Yoshino. Surprised, Yoshino runs out of the house. Then, by chance, she meets Furuta, with whom she had an affair in the past. He is transferred to Beijing. Furuta asks her to come with him and attacks her...