Her husband quit his job and started drinking every day. After coming home from her part-time job, Ryoko cleans the house. Seeing Ryoko's butt, her husband becomes aroused and pushes her down. Their son is watching. Ryoko, who was not able to get off from the forced sex, masturbates. Her son is watching this too. One day, while Ryoko is masturbating in the kitchen, her son comes in and pushes her down, saying, "I saw you doing it and masturbating. I can't take it anymore." From that day on, Ryoko and her son began a forbidden secret affair, kept secret from her husband.