Ever since her husband left for work, she has been deeply frustrated. Even though she indulges in her daily masturbation routine, her loneliness only grows. Kayo's sighs grow louder with each passing day. Her son Daisuke is heartbroken by Kayo's state and ponders if there is anything he can do for her. One day, he witnesses Kayo masturbating. Seeing this alluring scene, Daisuke comes up with the forbidden act of filial piety: to comfort her with his body.