Not in a Textbook

High school teacher Arihiko meets a girl on the street and scolds her for smoking. Somehow the girl takes a shine to him and transferred to his school. The girl, Aya even tries to move in with him, so Arihiko tries to send her back home, but finds out Aya is the daughter of a boss of a mafia leader. Aya's father tells Arihiko that he will be killed if he fails to keep Aya safe for three years in school. (Hakuhodo DY music & pictures)