Hisae's daughter, Maki, is dating a boyfriend named Ichiro. The two, who are about to get married, are making good preparations for the wedding, but Ichiro is somewhere in the sky. One day, when Hisae got out of the bath, Ichiro was standing there holding Hisae's underwear. Ichiro runs away saying sorry. From that day onwards, Ichiro and Hisae begin to have a lewd relationship.