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Miku, a teacher, was bullied by students at school. One day, Miku gets on a train wearing a sailor suit at the command of the students. Then, a hand approaching Miku's ass ... Miku, who is afraid of "Filthy ● ――!", Does something that seems to be unpleasant as much as she likes ... However, Miku feels touched by Filthy ●. Miku, who knew the intense pleasures, had been on the train many times since then.