元カリスマ店員で高校教師を目指す嘉納ハルコは、「3ヶ月臨時教師として働いてくれれば就職先を紹介する」と高校時代の恩師・秋元邦子に紹介され、日本語学校の臨時教師になる。
しかし、同僚の教師・鷹栖一樹と些細なことから口論となり、「生徒全員が卒業試験に合格できなければ教師になる事を諦める」と約束してしまったため、どうしたら生徒たちが日本語や日本文化を理解出来るのかと四苦八苦する。結局、全員を合格させる事は出来なかったため、高校教師になることをあきらめたハルコは、日本語教師の職にやりがいを見つけ仕事を続ける
Kano Haruko (Naka Riisa) is a charismatic shop assistant who has such excellent fashion sense that she has been featured in fashion magazines. However, she is unable to give up her dream of being a high school teacher. Haruko is asked by her former teacher to teach Japanese to foreigners for three months on the understanding that he would introduce her for the high school's Japanese language teaching position. And so, she becomes a trainee teacher at a Japanese language school where she coaches nine foreign students with strong personalities, including an Italian anime enthusiast and a Swede who is in love with ninjas, according to her own convictions, while setting her sights on becoming a high school teacher.