Aimi has gotten into the habit of masturbating to ease the loneliness of her husband, who is often away on business. Her father-in-law watches his son's wife with anguish every day. His suppressed sexual desires finally erupt, and he takes Aimi away from his own son. Her husband's colleague also sees Aimi as a sexual object, and after seeing her having sex with her father-in-law, he also rapes her, and the cycle of cuckolding continues.