Gokusen series revolves with the story of a granddaughter of a Yakuza boss. She's been with her father since her parents died and that became Kumiko as the next in line to head the family business as "Ojou".
Kumiko's life long dream is to become a teacher. Her grandfather approves it but the others in the family wanted her to take over and become their next boss.
Gokusen Series 1:
Yamaguchi Kumiko (Nakama Yukie) is a young, idealistic teacher. She enters Shirokin Gakuen and become the homeroom teacher of 3-D. Section 3-D is the hardest to maintain class in the school. The principal let her to be their teacher as long as no one will ever know about her family background, her being the 4th generation to the Ooedp Group. The students in this section have multi-colored hair, sloppy uniforms, absolutely NO respect to her.
Sawada Shin is the leader of the class. He is lazy but bright. He shows some interest in Yamaguchi when he become aware of her difference from other teachers. The class tried to bully her to make her quit but their attempts didn’t make anything. Yamaguchi encounter different types of students and learned about their background and help them out to graduate as a whole class. She struggle as they struggle and join them with all the pains and fun they will experience.Eventually the class learned to respect Yamaguchi and gave her a nickname “Yankumi”.
Gokusen Series 2: (This is my favorite among the three series.)
Shirokin Gakuen has been closed. Yankumi finds herself a job as a teacher of a few kids who doesn’t really benefit with her style of teaching. Through some twist of fate she was offered a job as a teacher in Kurogin Gakuen.
She was assigned to be the advisory teacher of the delinquent 3-D class. Her previous students became angels compare to this new set of students that she’s handling. On her first day she discovered that one of her student, Odagiri Ryu (Kamenashi Kazuya) has not been going to school. And when she asked, she was told that Odagiri has caused problems in the school and that Odagiri’s father and the school had a meeting and agreed that Odagiri will not go to school but still he will graduate. Yankumi don’t like this kind of set up and so she did everything for him to go back to school not knowing that there is conflict between Odagiri Ryu (Kamenashi Kazuya) and Yabuki Hayato (Akanishi Jin). They are the best of friends that became enemies due to a misunderstanding.The stories of the students have been revealed and lots of lessons have been shared. Such stories are from the students namely Takeda Keita (Koike Teppei), Tsuchiya Hikaru (Hayami Mokomichi), and Hyuuga Kosuke (Koide Keisuke).
Gokusen Series 3: (I like Takaki Yuya. He’s sooo Kawaii.)
Sawatari Goro (Namase Katsuhisa) told the director of Akadou High School that he had an experience on handling delinquent students. And so he was assigned to be the advisory teacher of class 3-D yet it shows that he can’t really handles those guys and so he recommend Yamaguchi Kumiko (Nakama Yukie) to be the teacher of class 3-D as he know what’s she’s capable of as they’ve been colleagues.
Sawatari Goro searched for Yankumi and he found her in a far away land waiting for a bus as she has been fired from her job as a teacher to foreign students. Sawatari and Yankumi agreed that she will be a teacher as long as she will not reveal her family background.On her first day, she thought that Ogata Yamato (Takaki Yuya) was the leader of the class but Kazama Ren (Miura Haruma) and his gang comes in and all of the students salute on him like he is the captain of the class. She found out that Yamato and Ren has been the leaders since they are grade 1 and now they are on the same class and no one wants to come down as the leader. But, Yankumi will not settle for a class that is divided and so she did everything for the two groups unite and became one.