Wikipedia
Gokusen
is a manga series by Kozueko Morimoto. The story follows Kumiko Yamaguchi, the granddaughter of a yakuza boss and teacher at an all-male private high school. In 2008, an SP manga was out, featuring some of Yankumi's (Kumiko) old students who are by now working adults.
In 2002, the manga was adapted into a television drama with Yukie Nakama in the title role. A second series was produced in 2005. An animated adaptation ran on Nippon Television from January 6, 2004 to March 30, 2004.
The third season of the (live action) series was aired as Nippon Television's 55th Anniversary Program in 2008.
A movie as part of the drama was released in Japanese theaters on July 11, 2009.