Gokusen

It's about a woman named Yamaguchi "Yankumi" Kumiko enters Shirokin High School to become a teacher. She's assigned to a class full of delinquents, at first the class keep annoying her or to make her quit school but after that they are respecting Yankumi. But, nobody knows the secret that Yankumi is actually the heir of Oedo family who is a powerful Yakuza clan. The anime series has 13 episodes and there are live action series which has 3 parts now. The 1st live action series has 12 episodes, 2nd series has 10 episodes and 3rd series has 10 episodes. There are some funny scenes as well, but I recommend this for teens and adults to watch.