Hyouma is a high school student. One day, Touko, his classmate who runs for the position of student council president and boldly declared "I will make this school my kingdom.", comes to his dormitory room and tells him that she is his fiancee. There is also a girl who stares at her. She is Sou, his bodyguard sent from his parents' home. "You can never become his fiancee...!" Like this, his new school life starts and he find himself sandwiched between the two parties racing for the student council presidency.