Every night, Rio, a lustful wife who never misses a night of lovemaking, moans and torments her father-in-law and brother-in-law, who spend sleepless nights. Not only that, but she also makes some kind of mistake almost every day, so they have no time to Kokoro. One day, when Rio, who has not had sex for a while because her husband is away on a business trip, masturbates to release her pent-up sexual desire, she gets carried away and breaks a family heirloom vase. As punishment, she is ordered to clean up in a nude apron, but her lustful father-in-law plays with her big breasts, calling it "punishment"...