Misaki Ayuzawa becomes the first female student council president at Seika High School, which has just transitioned from an all‑boys institution to a co‑educational one. Known among the boys as the “Demon President” for her strict disciplinary style, she uses her Aikido skills to confront misbehaving students and protect the girls. Behind her flawless public image, Misaki secretly works part‑time as a maid at a café to help support her struggling family, a job she keeps hidden from her classmates. Her double life remains intact until one day the most popular boy at school, Takumi Usui, enters the picture.