Gokusen (ごくせん, 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 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 in Nippon Television from 6 January 2004 to 30 March 2004.

The third season of the series was aired as Nippon Television's 55th Anniversary Program in 2008.

Source: Wikipedia