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In order to save the younger brother who goes to the boys' school from bullying, his sister Mahiro was able to sneak into the school dressed as a man and grasp the weaknesses of the bullies and stop the bullying. However, Mahiro suffers a counterattack from the bullies who know that Mahiro is a woman. At first it was bullish Mahiro, but gradually fell into the pleasure of being abusive, drowning in lust and disturbed.