Amamiya, a teacher and swimming club advisor, likes younger guys and has been secretly pursuing the team's ace, Kuroi. When Kuroi gets a girlfriend, she becomes jealous and transforms into a lustful monster teacher, stealing him away by tweaking his nipples... He appears like the wind, grabs him from behind, hugs him from behind, and tweaking his nipples, seducing him until he falls into depravity. "Does my girlfriend really make me cum like this?" "Which feels better, my teacher or my girlfriend?" His relationship with his girlfriend is clearly on another level...