Yamaguchi Kumiko is the granddaughter of a Yakuza boss and is completely at peace with the fact that she is the heir of her grandfather's empire. However, she leaves most of that up to the rest of the family and their talented lawyer, whom's she has more than a slight crush on. Instead, Yakumi works hard to fulfill her hearts desire to be a teacher. But she must hide her background so she doesn't get fired from her first teaching job, which is at a school filled with tough kids and difficult students.