Newly graduate Yamaguchi Kumiko an idealistic teacher who entered Shirokin High to be a math teacher. Having high hopes for her students, her world turned up side down when she finds out that she'll be teaching the class 3-D the hardest class to take care of. Class 3-D is a bunch of students who looks more like delinquents and trouble makers. The students show no respect to teachers nor a little kindness. Each and every student doesn't like teacher for almost everyone has no good memories of them. The leader of the class is Sawada Shin. He is well respected for there are rumors that he beat a teacher to death. The students try there hardest to bully and make fun of her so she'll quit but all there efforts went to waste because Yamaguchi ain't an ordinary Teacher. Yamaguchi Kumiko is actually the 4th generation heir to Oedo group, a yakuza clan. Even though everyone in there clan wants her to the next leader, she made up her mind and so everyone accepted it.
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Kozueko Morimoto
Season 0
Season 1
Season 2
A few years passed since Yamaguchi left Shirokin Gakuen which closed after some time. Everything has been difficult for Yankumi the following years for her new students are little kids that doesn't suit her way of teaching. Change is on the horizon when a bad hair day came but with a little twist became okay. Mr. Sawatari Goro, Shirokin's vice Principal is in need of teacher in the school he is teaching. But not just ordinary teacher... he specifically need Yankumi! The school is Kurogin Gakuen. When she arrived in the school she was really happy till she knew that she is to handle another bunch of 3-D but this time meaner and more violent! As usual, she has to hide her background or else she'll lose her job. She does her best to be nice to every student but it seemed that it'll be harder for the students are worst than the word worst. How will she face them? Is it a new challenge?
Season 3
Her ex-boss, Goro Sawatari (Katsuhisa Namase) now works at Akado Gakuen High School as a vice principal. Although the head director of the school board Rroko Akagi (Kyoko Eba) specifically orders him to handle the problematic class, 3-D, it was way too much for him. Sawatari then tried to reach Yankumi and went far away to a southern island to find Yankumi, and convince her to work for Akado Gakuen High School. Yankumi accepted the offer , only to find out that she'll teaching bunch of mean students. Not only that, there are two group fighting over "who'll rule Akodou" thing. Will Yankumi’s strong belief in students and teaching work this time?