Do you know what kind of sensei Yamaguchi Kumiko is?

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Yamaguchi Kumiko, is dull looking high school teacher who come s from a yakuza family and resolves with dutiful, soul, justice and love. Yamaguchi is hired to at a prestigious all boys high school. Her class is full of troublemakers and punks that no teacher can handle. Everything seems hopeless but Yamaguchi in her unique ways tries to turn her students around in 3 months remaining before graduation.