Who would have thought he would be attracted to his own mother... Ever since he ran into his mother Mari (Mari Kuroki) naked in the bathroom and saw her body, Koji couldn't get it out of his head. Her mature charm. Her soft white skin. And her dripping wet breasts. Whenever he recalls that scene, strong emotions come back to him, and he can't suppress his erection. This isn't normal. But no matter how many times he masturbates, his feelings don't calm down, and Mari's naked body comes back to him more vividly. He's at his limit... That night, Koji finally sneaks into his mother's bedroom where she is sleeping.