Naoki will live with her daughter-in-law and her parents. However, in fact, there is a secret between Naoki and Nanako, who was a former colleague and spent an unfaithful night. The desire for Nanako, who has accumulated over the years, explodes under one roof! "I can't forget my mother-in-law's boobs!" My mother-in-law's body soon became an immoral act regardless of whether her family was nearby.