Nozomi, a mother who is weak with computers. Her daughter Mina invites her boyfriend Daisuke over to their house to teach her how to use computers. While the two of them are teaching each other how to use computers, both the mother and the boyfriend start to become sexually conscious. While Daisuke is having sex with Mina in his daughter's room, he notices his mother masturbating in the hallway, peeking at them! That night, when Daisuke is taking a bath alone, his mother says, "I'll wash your back!" and washes his back, which makes Daisuke confused. He is in agony and gets his back washed, which makes him get an erection. Nozomi, seeing his manly penis, can't help but suck it. Once their desires are ignited, the two of them, aided by the sense of immorality of being her mother and her daughter's boyfriend, end up having a passionate encounter...