Kiho is a serious, reserved teacher who has lived quietly with little interest in sex. When she is molested on her commute, the secret touch and the tension of being unable to make a sound awaken desires buried deep inside her. The immoral thrill stands in stark contrast to the respectable face she shows her students, and before long she is waiting for the groper every day. Her urges finally overwhelm her, and she loses herself in sex with him in public, longing for the nameless man to touch and violate her until she is utterly spent. Ashamed yet unable to deny her desire, she admits that she has failed as a teacher.