Gokusen made its sensational debut in 2002, with mega hit 2nd series following in, 2005, and is now returning even more powerful than ever in 2008. Kumiko "Yankumi" Yamaguchi (Yukie Nakama) lives in the world of Yakuzas as the 4th generation heir of Oedo Ikka. She is self-sacrificing to protect the weak, she's tough at fighting, and she firmly believes in the importance of friendship, dreams and family, she teaches and advises punks as a hot-blooded high school teacher.

Her ex-boss, Goro Sawatari (Katsuhisa Namase) now works at Akado Gakuin High School as a vice principal. Although the head director of the school board Ryoko Akagi (Kyoko Enami) speficically orders him to handle the problematic class, 3-D, the punks in the class are too much for Sawatari. Sawatari goes far away to a southern island to find Yankumi, and convince her to work for Akado Gakuin High School to be responsible for the class 3-D. Yankumi accepts the offer, only to find the classroom of punks, where two rival groups of students are always at each other's throats... Will Yankumi's strong belief in students and teaching work this time?

 在2002年的第一季和2005年第二季皆引起巨大的反响下，「极道鲜师」的第三季终于在万众期待之下上演。

本季的主题与第一、二季一样， 即把「友情」「家族」「梦想」和「争吵与暴力的不同」的信息传递给学生、家长与老师。

主角山口久美子（仲间由纪惠饰）是一名热衷于教学的老师，六年前终于达成梦想成为中学老师，在「黑银学院」任教。虽然任教的一班学生都是问题学生，可是她却没有放弃，努力帮助学生们走回正途。三年前她离开了这所学校，到了南部的一个小岛任教。此次受邀请到「赤铜学院」当三年D班的老师，可是这一班学生比她以前在「黑银学院」任教时的学生有过之而无不及……. 三年D班中有由风间廉（三浦春马饰）与绪方大和（高木雄也饰）为首的两大敌对派，每天都会因诸多小事而发生冲突。

面对如此多的问题学生，到底山口老师如何感化这班顽劣的学生呢?
剧集透过她感化学生的情节，让年青人重新思考自己的责任与角色。