Kamen Teacher (2013)

Gota Araki (Taisuke Fujigaya) begins work at a new high school. He is assigned to the school's notorious 2nd Year, Class C as their homeroom teacher. All of the students in Class C are violent delinquents, who have no respect for authority figures. Gota Araki quickly becomes acclimated with the students during his first day. He is beaten by his students, but he doesn't fight back. Gota Araki wants to breakthrough the student's tough outer shells, but he soon discovers that the students are more wounded than he could ever imagine. Gota Araki then turns to his mask. Will it take power or heart to change his students?