Shonan Junai-gumi (released 1990-1996)
deals with the Oni-Baku (Demon Explosion) duo, consisting of Eikichi Onizuka and Ryuji Danma, and their quest to lose their virginity and reach maturity. They are widely feared bōsōzoku, and are known for their tenacity and viciousness in a fight. However, this lifestyle does not exactly endear them to the opposite gender, so they decide to change their ways. However, this is easier said than done. As the story unfolds, we meet the Oni-Baku's wide range of friends and foes, and the crazy situations they all get into. The story is initially a gag manga, but more serious issues present themselves as it continues, eventually striking a balance similar to that of GTO (which this manga predates).

Bad Company(1996)
one volume prequel to Shonan Junai Gumi which was followed by the better known series Great Teacher Onizuka
Bad Company is made up of two parts, each dedicated in part to how Onizuka and Ryuuji meet and get their motorcycles.


and then you have GTO


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