Haruko Kano (Riisa Naka) works as a "charisma salesperson" at a clothing store for girls in Shibuya, but aspires to become a teacher. One day, she meets an old high school teacher who suggests that that Haruko would make a fine Japanese language instructor & offers to help her get a job at a public school. However, the teacher first requires Haruko to work for three months at a private school. He hands her the textbook book which is for elementary school students.  When Haruko shows up for her first day as a Japanese language teacher she discovers that the school is for foreign students learning Japanese! Her students asks Haruko questions about her own Japanese language that makes Haruko realize that she doesn't even fully comprehend her own native language. Can Haruko survive her first few days as Japanese language instructor? Will the students learn from Haruko?