Miyu is a woman engaged to a man whose only son is scheduled to marry her this autumn. The young, affectionate couple spent their days happily visiting wedding halls in the city on weekends, claiming they were meeting to discuss the reception and wedding favors. However, the father-in-law always watched the young, fresh curves of his "son's fiancée" with a damp, insidious gaze. One day, when the son left for work and left Miyu behind, the father-in-law's member became embarrassingly hard and erect, despite his age...!