Reiko is a passionate, dedicated teacher. One day, her student, Maiko, asks her to accompany her to meet the person who found her student ID card. The man who found it, Kawada, threatens them, demanding a sexual encounter in exchange for returning the card. To protect Maiko, Reiko takes her place and ends up sleeping with Oikawa—a man who acts as a senior figure to Kawada. Afterward, Oikawa continues to pressure her for more, but Reiko firmly refuses. Yet, in truth, she finds herself unable to get Oikawa out of her mind…