Eikichi Onizuka and Ryuuji Danma are members of infamous biker gang, Oni Baku. When not out riding around, they can be found in school, trying to pick up young women. This is the story of the young Onizuka, who would later become the greatest teacher in Japan.

The first 10 volumes of Shonan Junai Gumi! was published in English as GTO: The Early Years by Tokyopop based on the 15-volume deluxe edition from June 13, 2006, to February 9, 2009. Vertical Inc. picked up the license and released the remaining volumes from February 21, 2012, to October 30, 2012. The manga was adapted into a Japanese live-action TV series that premiered on Amazon Prime Video on February 28, 2020.