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Prefectural High School, Modern Japanese Language, Class 3-C, Homeroom Teacher: Jun Megami (27) - Complete Record of Class Collapse.

There is the one you love, and the one who holds a weakness over you. Jun is a serious and inconspicuous person, but as a kind teacher, she was also well-liked by her students. Having never been immune to men, Jun ends up accepting a male student's confession and having a relationship with him. Even though she knows it's wrong, she gradually becomes hooked on that relationship. One day, at the student's request, she films their sexual act with a smartphone, but that smartphone is confiscated by a fellow teacher, and their relationship is exposed...