Her only son is engaged to be married this fall to Kana. The happy, young couple spend their weekends happily going to a wedding hall in the city to discuss the reception and wedding favors. Her father-in-law is always gazing at the young and lustrous curves of his "son's fiancee" with a sly, sinister gaze. One day, when his son goes to work, leaving Kana behind, the father-in-law finds his penis erect to an embarrassing degree that is beyond his years...!