Ichika was unsatisfied with her body and mind in sex with her selfish husband. One day, Yumiko's son, Tatsuya, appears before Ichika, who was enjoying a well-end meeting with Yumiko, the mother of the Takada family next door. Ichika is surprised by Tatsuya, who has transformed into an adult man without seeing him for a while, but Yumiko still treats Tatsuya as a child. Ichika, who feels sorry for Tatsuya, happens to see Tatsuya masturbating, and she finds out that Tatsuya's lower body has become an adult.
