JDorama: Gokusen

GOKUSEN Season 1

Fresh out of college, Kumiko "Yankumi" Yamaguchi becomes a math teacher at Shirokin high school. Unfortunately for her, she's assigned by the school board as the homeroom teacher for class 3-D, which happens to be the class of delinquent students. When the class attempts to make a living hell out of Yankumi's career, they fail as her persistence and aggression gain her respect. However, little does anyone in the school know that Yankumi is actually heir to the Oedo Group - one of Tokyo's most powerful yakuza clans. If anyone finds out that Yankumi is a yakuza member, her career as a teacher could be in jeopardy.

Cast 

Jun Matsumoto as Shin Sawada
Yukie Nakama as Kumiko "Yankumi" Yamaguchi
Hiroki Narimiya as Noda
Hiroshi Ryogoku as Makoto Sugawara
Ikki Sawamura as Tomoya Shinohara
Katsuhisa Namase as Goro Sawatari (Shirokin Gakuen Vice Principal)
Ken Kaneko as Tetsu Asakura
Ken Utsui as Ryuichiro Kuroda
Kenji Anan as Hiro Wakamatsu
Misaki Itou as Shizuka Fujiyama
Ryosei Tayama as Shirokin Gakuen Principal
Shinji Uchiyama as Minoru Tatsukawa
Shun Oguri as Haruhiko "Uchi" Uchiyama
Tomohiro Waki as Teruo "Kuma" Kumai
Yuko Nakazawa as Kikuno Kawashima
Yuuma Ishigaku as Minami

GOKUSEN Season 2

Kumiko "Yankumi" Yamaguchi moves to a new school - Kurogin High School - to teach yet another class of delinquent boys. Once again, she must help solve the problems of her students; at the same time, make sure that nobody in the school knows her ties with the Oedo Group.

Cast

Jin Akanishi as Hayato Yabuki
Kazuya Kamenashi as Ryu Odagiri
Yukie Nakama as Kumiko "Yankumi" Yamaguchi
Hiroshi Ryogoku as Makoto Sugawara
Jun Inoue as Ginji Kurokawa
Katsuhisa Namase as Goro Sawatari (Kurogin Gakuen Vice Principal)
Keisuke Koide as Kosuke Hyuuga
Ken Kaneko as Tetsu Asakura
Ken Utsui as Ryuuichiro Kuroda

 GOKUSEN Season 3

After being fired from her job teaching foreign students, Kumiko "Yankumi" Yamaguchi is once again approached by her former superior Goro Sawatari to return to Tokyo and work at Akadou Academy, where she becomes the homeroom teacher of yet another ragtag group of delinquent boys - otherwise known as class 3-D. She must deal with a class divided by rival classmates Yamato Ogata and Ren Kazama.

Cast

Haruma Miura as Ren Kazama
Yukie Nakama as Kumiko "Yankumi" Yamaguchi
Yuuya Takaki as Yamato Ogata
Aki Hoshino as Sakura Ayukawa (School Nurse)
Akito Kiriyama as Satoru Kuraki
Aya Hirayama as Aoi Takano (English Teacher)
Hideo Ishiguro as Kengo Honjo
Hiroshi Ryogoku as Makoto Sugawara
Jiro Sato as Hosaku Yajima (Classics Teacher)
Junta Nakama as Rikiya Ishimura