Fumie, a mother, has been feeling lonely as a woman for a long time because her husband has had erectile dysfunction since she gave birth to their only son, Kota. Finally unable to bear the loneliness any longer, she has fallen into a man-woman relationship with Kota, the man closest to her, and has been repeatedly having sex with him. Unlike her husband who has erectile dysfunction, Kota is young and has a ``virile'' sex drive, so Fumie thought that her sexual desires would be satisfied, but it just keeps getting worse!