Great Teacher Onizuka (グレート・ティーチャー・オニヅカ, Gurēto Tīchā Onizuka), officially abbreviated as GTO, is a Japanese manga series written and illustrated by Tooru Fujisawa. It was originally serialized in Weekly Shōnen Magazine from January 1997 to February 2002. The story focuses on 22-year-old ex-bōsōzoku member Eikichi Onizuka, who becomes a teacher at a private middle school, Holy Forest Academy, in Tokyo, Japan. It is a continuation of Tooru Fujisawa's earlier manga series Shonan Junai Gumi (lit. "Shōnan True Love Group") and Bad Company, both of which focus on the life of Onizuka before becoming a teacher.