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.

It's time for the Midorigaoka school festival, and rumors abound that Mr. Maki has some trouble planned. Mafuyu escapes from the Hanabusa mansion and heads to campus in her Natsuo disguise, while Takaomi welcomes a posse of Midorigaoka alumni and some of Mafuyu's delinquents from Saitama. With the troops all assembled, the only thing left to do is wait for Mr. Maki to make his move...