"Why did this happen!" Chisato had a physical relationship with her son Shinichi, hiding behind her husband. "No one will be happy with this kind of relationship." Senri's feelings of guilt increase day by day, and she decides to stop the relationship. However, Shinichi didn't have an ear to hear and asked for it even more violently with his sexual desire. "This is really the last time," Chisato tells herself, and when her husband goes out, she accepts a young and fierce inferiority without a break.