Chisato Shoda, the wife of a couple whose nightlife is disappearing. My son, Kazuya, thinks of such a mother and indulges in masturbation every day. One day, Kazuya's homeroom teacher, Sasaki, who came to visit his home, held him to take care of his son. Chisato, who is not satisfied with her husband's sloppy SEX, remembers SEX with Sasaki and makes a phone call. Then the relationship between the two...