Years after tearfully promising his childhood friend Kagyu Jubei that he would become a teacher who stands up against bullies, Negizawa Kamo meets Kagyu again under unusual circumstances. To prepare for this reunion, Kagyu, who has developed feelings for Negizawa, trained herself to fight and protect him.
As Negizawa works towards fulfilling his dream of becoming a great teacher, he also has to fend off the advances of numerous women who are attracted to him, while Kagyu tries to protect him from them in hilarious ways.