Yui, a high school girl, has a secret relationship with her married teacher. Feeling guilty for being a teacher and being married, she has a forbidden relationship with her student, so she brings up the topic of breaking up. "You can't be satisfied with your wife anymore, can you?" "I'll make you feel even better." His firm resolve crumbles as she whispers sweet temptations in his ear, and today after school he ends up having sex with Yui over and over again at their usual love hotel.