@ Guza: Thank you very much. But you don't know my normal way to speak english. I think you'd run away.
Here a short summery of that manga
"The plot involves Yamaguchi Kumiko, the granddaughter of a Yakuza boss. Her parents died when she was younger, and her grandfather has no other descendants, so Kumiko is next in line to head the family business. However, her lifelong dream has been to become a teacher. While her grandfather approves of her choice, others in the family want her to become the next boss, especially Tetsu, who is secretly in love with her.
Kumiko (known by her students as "Yankumi") becomes a teacher at an all-boys private high school. Her class is full of delinquents, but she tries her hardest to teach them not just about academics, but about lessons of life, much like any "dedicated teacher" story. Though she's forced to keep her family a secret from the public, her Yakuza upbringing gives her the strength and the experience to reach out to her students, while also providing comedic relief."
And the hole link:
Gokusen - Wikipedia, the free encyclopedia