ぶれいボーイ

A man slammed the ass of a high school girl who was smoking in the train, and shouted "Bad girl!". This man, Akuzu Buji, is a Japanese history teacher who has been assigned to Chikushi high school. The gang leader, Yurie, who was humiliated in the train, tries to prevent Akuzu from going to school...! (Source: Futabasha, translated)