Rei is a married woman who teaches at the same school as her husband. One day, her husband reports that Machida, the class she is in charge of, seems to be in a bad mood. The next day, her husband witnesses a student, Yamaguchi, bullying Machida. At that time, when her husband vigorously defends Machida, Yamaguchi is injured. After school, Rei calls Yamaguchi and Machida to try to find out what happened, but Yamaguchi uses his injury as an excuse and threatens to tell the Board of Education. He then orders her to show him her breasts if she refuses.