Okada, who is staying over at his friend Tetsuya's house, falls in love at first sight with Mio's beautiful mother, who is no exaggeration to say is the most beautiful woman in the world. That night, Okada goes to the kitchen to get a drink of water and peeks at Mio, who is masturbating while on the phone. Her obscene appearance is beyond imagination, and Okada's groin becomes hard. There is no way he can miss such an opportunity. Okada, who has a hold on Mio's weakness, threatens her to offer him her body, but...