Gachitora Abarenbou Kyoushi In High School

A heady mix of high school, a yakuza style teacher and a few students who don't mind a scrap. Even a few maid costumes thrown in there - not too sure how they manage to get involved in the story. Plenty of fisticuffs with a few side quests such as fishing thrown in for good measure. Title translates as Wild Teacher In High School.