This romantic comedy, based on Hiromitsu Takeda's manga series, follows Takeru Ohyama, a typical teenage boy with a penchant for perversion. After enrolling in a newly co-ed, exam-free high school, his hopes for a smooth transition are shattered when he discovers that all students possess a unique weapon called a Maken, which allows them to wield magical powers in duels. Amidst the chaos, Takeru must navigate the challenges of finding a Maken that suits him while managing girl troubles and the pressures of fitting in.