Ryuuichi Kaizu, a shrewd and unscrupulous pupil, possesses both an unyielding ambition and an unquenchable greed. His intellect is seconded only by his rapacity. Upon receiving a gift from a well-off fellow classmate, Emi Naito, Ryuuichi instantly perceives the benefits of establishing a relationship with her. Without her consent, he endeavors to possess her, with the intention of manipulating her to serve his own interests.