Otoboku 2 begins about two years after Mizuho's graduation. The main protagonist Chihaya Mikado was truant at his school because of harassment in the school and of a distrust in men. His mother cannot bear to watch him be in trouble, so she makes him transfer to Seio Girl's School, her old school. He dresses as a girl and introduces himself as Chihaya Kisakinomiya. Chihaya meets another protagonist Kaoruko Nanahara, who once rescued him from a playboy, and he begins to live in the dormitory building. He becomes the focus of public attention due to his attractive face and figure, and due to high grades at studies.

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