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.

Summer break doesn't mean rest and relaxation for Mafuyu. She has a ton of homework to finish, but finds herself distracted when a drunken colleague shows up at Takaomi's apartment. It's up to Mafuyu to convince the guy that Takaomi is a good teacher, but will he take the word of an obvious delinquent?!