Keiko Okumura (Hojo), a female teacher who has been in the teaching profession for more than 10 years and is now the head of the grade. One day, she sees a girl crying on the side of the road. When she calls out, she says, "She was molested on the train." Apparently there are other victims, and Keiko, who has a strong sense of justice, gets angry at her despicable molestation and starts guarding her on her train. Keiko looks out for her students on a crowded train. But before she knew it, a suspicious shadow creeped up behind her Keiko and took her hand to her lower body...
