Mizuki, a new female teacher at a part-time school, seduces a married senior teacher and they start an affair. Although Mizuki is younger than her, she treats the older students with contempt, which earns her the dislike of everyone. Meanwhile, the physical education teacher finds them having an affair on school grounds, threatens to tell the whole school, and rapes them. The incident is also secretly filmed by a perverted teacher from the same year who has feelings for Mizuki, and calls Mizuki in with the students who have a grudge against her...