"Ugh, I want to have sex!" Keita, who doesn't have a girlfriend, has been spending his days in a state of frustration, just producing and releasing sperm needlessly. He's reached his limit. Just when he thought his mind was about to snap, he sees his mother, Kaori, cleaning. "Mom's breasts look like they're from an erotic manga..." The swaying cleavage was exactly like the scene he'd been reading in the erotic manga he'd been indulging in lately. Keita, who had fallen into an extreme state of sexual frustration to the point where the line between reality and fantasy was blurring, realizes that having sex with his mother like in the erotic manga would be the solution.