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Mayu, the younger sister, and Kenji, the older brother, who go to the same school, have been having a physical relationship without telling anyone. However, the younger sister was a "tsundere," a stranger to her older brother outside of school. One day, Kenji hears a rumor that Mayu has a boyfriend in the same class. Kenji is jealous and can't control it, so he takes Mayu around and has sex with her all over the school....