Kiho, a teacher, is earnest and reserved, and has lived a quiet life with little interest in sex, never masturbating. One day, when she encounters a molester on the train to work, the pleasure of being touched in secret increases, and the tension that keeps her from making a sound, slowly brings to light the obscene feelings that had been sleeping deep inside her. The immoral act is the polar opposite of the serious teacher face she shows to her students. Before she knew it, Kiho had transformed into a slutty female teacher, waiting for molesters on the train every day... The teacher's hidden perversion. "I didn't know... I was such a lewd woman... Even though I know molestation is an inhumane act... I can't lie to myself anymore..." The pleasure wells up! The urge is unstoppable! The desire is uncontrollable! She is completely absorbed in sex with the molester in public! She wants that person to touch her again... She wants that person, whose name she doesn't even know, to rape her until she is a mess. "I'm sorry... I'm not fit to be a teacher..."