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 yakuza cunning and takes up the role of a normal air headed graduate, landing a high-school teaching job. Now Kumiko is determined to understand the teen-age mind, teach higher math and maybe carry on a little romance. Of course, there's always the danger of her slavishly loyal army of brutal hit men murdering the students who misbehave.15 tankoubon by Kozueko Morimoto make up the manga that this anime is based on. This series is published in Japan by You Comics.

In addition to the anime adaptation, there were 2 live-action Japanese TV series. In the first series, Jun Matsumoto costars as Shin. (Matsumoto was also Tsukasa Domyoji in the Japanese live-action TV series of Hana Yori Dango.)