The Gokusen

Kumiko "Yankumi" Yamaguchi joins Shirokin Gakuen Private School to work as a math teacher. She is made the homeroom teacher of class 2-4, which is full of delinquents. At first, the class does everything it can to shake her, but nothing works. Before long, Yankumi earns the class's respect. What the school does not know is that she is the heir to the Oedo Group, a powerful Yakuza clan. So as Yankumi tries to build her career as a teacher, she also has to hide her Yakuza background.