Gokusen

Kumiko Yamaguchi is the heir of the Oedo Yakuza family, but it's her dream to teach the youth of Japan. She puts aside her yakuza cunning and takes up the role of a normal air headed graduate, landing a high-school teaching job. Now Kumiko is determined to understand the teen-age mind, teach higher math and maybe carry on a little romance. Of course, there's always the danger of her slavishly loyal army of brutal hitmen murdering the students who misbehave. (official distributor synopsis)