Oresama teacher, vol. 16 (Viz Media)

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. After returning to from the school trip, Mafuyu and the rest of the Public Morals Club learn all about Akki's adventure with Komari. The story makes Mafuyu realize that all the attacks from the Student Council so far have been solo affairs. Why haven't they teamed up to take down the Public Morals Club? Determined to get to the bottom of this mystery, Mafuyu sneaks into Hanabusa's lair...the Student Council Room!