Although her relationship with her husband is good, Asami is frustrated and unable to be satisfied by her husband's declining libido. One day, she becomes close to Yamazaki, the head of the neighborhood association, and has an affair. Sex with Yamazaki brings her a pleasure she cannot experience with her husband. Every day, when her husband and son go to work, Asami welcomes Yamazaki in. However, her son finds out about their affair. Yamazaki stops coming, and the affair comes to an end. She tells herself that this is fine, but Asami's body, which has become aroused, is reaching its limits. Then, by chance, she sees her son's penis...