Mafuyu is the no-nonsense, take-charge and hard-hitting leader of her high school gang. But when she gets expelled for being a delinquent, her mother, fed up with her daughter's wayward ways, sends Mafuyu to an isolated school far off in the country.

The yearly culture festival is coming up fast, and it's a great chance for Midorigaoka Academy to shine. But disappearing students and rising tensions between the academy and nearby Kiyama High could turn the festival into a full-on disaster! Can a pack of delinquents save the day and the school?