Based on the manga series "GTO" by Tohru Fujisawa (published from May 1997 to April 2002 in Weekly Shōnen Magazine).
Onizuka (Akira) is sent as a temporary teacher to the high school he graduated from in Shonan, Japan. At the high school, he faces difficult problems including a high school student’s pregnancy and a student refusing to attend school. Onizuka's past is also revealed through people who knew him from his past.