The "New Kids War" series tells about Otsuki Kaori, an elementary school teacher who was assigned to the new school over the principal and the child who committed the bullying. Instead of the teacher who was hospitalized due to the stress of the class, the principal of the new school was a good understanding person who was sent to a new elementary school even if he knew that Kaori had a problem. Soon after she came, a girl student named Kawai Hana. Kaori stayed at the boarding house until she found an apartment, but the boarding house was Kawai Hana's house.