Takeru Ohyama, a young and normal yet perverted minded guy, now goes to a school where, unknown to him, combat and magic is used. On the first day, he meets Haruko Amaya, his childhood friend, after three years, as well as Inaho Kushiya, a girl who says she's his fiance, and Kodama Himegami, a blonde who wants to kill him. Finding out that there are many girls there that just don't like him, he is told that everyone there uses a special magic ability while using an item or weapon called a Maken. Later, he finds that no Maken is acceptable for him and doesn't know what to do, since in this school the students get into duels that showcase their magic and combat power, to which he seemingly has none. In order to ensure fair duels, he joins Maken-ki, the student body responsible for managing things around the school.