One Spring, the Shirogane High school appoints a new teacher, Yamaguchi Kumiko. With her lame clothing and her glasses, she seems to be not the cleverest teacher there is, and of all classes, she has to be assigned to the students of class 2-4, famous for their rampancy and always causing nothing than trouble.
She however is discountenanced by nothing that happens - because she derivates from the head of a Yakuza family, the Ôedos, where even a crying child keeps silent! She hides her heritage and her father's profession in order to get her long aspired job as a teacher, but since she was a little child she soaked in the sprit of dignity, always keeping silent.
With her sense for justice and extraordinary strength, she solves every problem in school with muscle power! Yamaguchi Kumiko's nickname becomes Yankumi. From now on, she saves the weak and breaks the strong and starts to forget her mildness while teaching!
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