Kumiko Yamaguchi is the heir of the Oedo Yakuza family, but it's her dream to teach the youth of Japan. She puts aside her cunning nature and takes up the role of a normal air-headed graduate, landing a high-school teaching job. Now Kumiko is determined to understand the teenage mind, teach higher math, and maybe carry on a little romance. This is assuming she can stop her slavishly loyal army of brutal hit men from murdering the students who misbehave.