At a school known for its extremely strict rules, Sumikawa Roa, a beautiful, gyaru-styled honor student, is labeled a delinquent due to an absurd regulation banning big tits. Despite her excellent grades and cheerful personality, she's unfairly targeted by teachers' prejudice and treated as a threat to school discipline. To "reform" her, she's subjected to excessive disciplinary measures—pinching, groping, squeezing, and licking—as part of so-called educational guidance. Set against this unjust system, a five-part story unfolds, portraying an unconventional school life where rigid rules clash with the unexpected side of an exemplary student.