Great Teacher Onizuka - グ レ ー ト テ ィ ー チ ャ ー オ ニ ヅ カ

Eikichi Onizuka graduated from a third grade university, and sets out to become a teacher. So luckily, despite the fact that he is a zoku (thug), he is hired as a substitute in a high school.
 
He will give a hard time to his superiors and his co-workers. But he will also solve stories between parents, teachers, and students and will eventually stand out from other teachers, which will earn him the respect of his students.