Great Teacher Onizuka, officially abbreviated as GTO, is a Japanese manga series written and illustrated by Tooru Fujisawa. It was originally serialized in Kodansha’s Weekly Sh?nen Magazine from January 1997 to February 2002, with its chapters compiled into twenty-five tank?bon volumes. The story focuses on 22-year-old ex-b?s?zoku member Eikichi Onizuka, who becomes a teacher at a private middle school, Holy Forest Academy, in Tokyo, Japan. It is a continuation of Fujisawa’s earlier manga series Shonan Junai Gumi and Bad Company, both of which focus on the life of Onizuka before becoming a teacher.