Kumiko Yamaguchi, the 23 year old granddaughter of a yakuza boss, becomes a teacher at Shirokin Gakuen, an all boys high school.

Kumiko asks the class to behave for her evaluation test but no one shows up for class on the day of the evaluation. Shin decides that everyone will...

After Kumiko saves a woman from a drunk man, she is surprised to find that the woman is Kuma's mother. Kumiko grades math tests and after she learns...

After being suspected of stealing, the group including Kumiko, set out to catch the real thief.

Kumiko must be the head of the Ooedo clan while her grandfather is hospitalized. This episode shows some of Kumiko's childhood.

Shin and Kuma see Kumiko get into a car with two people who are part of the Ooedo clan. They follow her to her house but are caught and Kumiko and...

Ms. Fujiyama tries to get Ichikawa, a good student with bad friends, to join the choir club. Some of Ms. Fujiyama's past as a middle school teacher...

The class goes on a field trip but things go bad when Uchi is kidnapped. It turns out that they saved the wrong Uchi but luckily they find the Uchi...

The school has a festival and Kumiko's class is having a host club but things don't go well as everyone leaves to go fight the seniors except for...

Many students is school start to wear a cat badge which is worth 10,000 yen so Kumiko decides to check things out. She finds the people selling them...

Kumiko learns that Shin's father is going to have him drop out of school and once she learns why, Kumiko decides to try and get Shin to stay in...

The board of directors decides to close down Shirokin Gakuen but Kumiko won't allow them. The directors decide that if the school can become number...

After the vice principal discovers Kumiko's background, she resigns as a teacher. After leaving the school Kumiko is kidnapped and Shin goes after...