Gozou travels to Tokyo to visit his son and daughter-in-law, and upon seeing his son's busy schedule, he deduces that the couple is not having sex. Eagerly awaiting the birth of his grandchild, he becomes convinced that his daughter-in-law's sexual allure must be enhanced. One night, Gozou makes up his mind and forcibly has a relationship with her. Although she was inexperienced in sex, he trains her daily, turning her into a captive of carnal desire. However, there is a shocking ending that only his son doesn't know about...
