Shiratori Nagisa, is an Idolsinger, and loves to fight.
She is strong and very good at martial arts. She cuts her hair and dresses like a boy. She disguises herself as a boy and calls herself Ohtori Nagiza. She plays two roles, Shiratori Nagiza the Girl, and Ohtori Nagisa the Boy.
Nagisa has to succeed her father's martial arts school which is going bankrupt. To collect strong pupils for the school, she begins to attend a junior high school dressed in a men's uniform. There are lots of bad students in the school. With such unusual characters, Nagisa's junior high school life is just beginning!!