Hisae's daughter, Maki, is dating her boyfriend, Ichiro. The couple is soon to be married and are happily preparing for their wedding, but Ichiro is somehow distracted. One day, when Hisae gets out of the bath, Ichiro is standing there holding her underwear. Ichiro apologizes and runs away. From that day on, Ichiro and Hisae start to have an indecent relationship...