Kana, a diligent and popular female teacher, was a favorite target for male students because of her beauty and figure. One day, during class, a student secretly filmed up her short skirt. In exchange for not spreading the photo, she was forced to remove her panties and humiliate herself by spreading her cheeks. The student even got hold of a photo of her bare anus, and his harassment escalated! At night, he forced her to walk around the school naked, illuminating her anus, and gangbang her with her cheeks spread open... However, this humiliating experience gradually turned into excitement for her...