Asuna Sugihara, a modest transfer student, arrives at the elite Saint Rei Seine academy, where she is immediately intimidated by the powerful Student Government President, Yurika Ichinomiya. After witnessing Yurika's sadistic side and suffering a traumatic assault on campus, Asuna is lured into joining the student government under the guise of protection. However, she soon discovers that Yurika's kindness was a trap designed to isolate her and claim her as a personal toy.