Haine Otomiya, a gang delinquent in her early teens under the name "Seashore Cinderella", was handed to the Otomiya family by her father in exchange for a fifty-million-yen loan. At fifteen she enrolls at the elite Imperial Academy to chase Shizumasa Tougu, the student-council "emperor" who once told her to live as she pleased. Given the top platinum ranking, Haine becomes his bodyguard inside the council's rigid hierarchy.