GokusenGokusen.

Gokusen (ごくせん) is a Japanese manga series written and illustrated by Kozueko Morimoto. It was serialized in Shueisha's josei manga magazine You from 2000 to 2007, with its chapters collected in 15 wideban volumes. The story follows Kumiko Yamaguchi, the granddaughter of a yakuza boss and teacher at an all-male private high school.