Quote from TofuQueen

There's also Bad Company, which is a prequel to Shounan Jun'ai Gumi (though it may have been written later, not sure about that).

Supposedly, it was part of SJG, But they ended up making it its own series since people liked it so much. People being THEM DAMN DIRTY APES!... But i digress.

I'll have to re-read it to make sure, but i believe it goes SJG, BC, Then GTO. But if ryuji and eikichi meet in BC, then its obvious that should be read first.... Ah, im just going by what ive read, To find out yourself, just F***** google it xD
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Taken from the description.

"A short prequel to Shounan Jun'ai Gumi and pre-prequel to GTO about how Onizuka Eikichi and Danma Ryuuji meet. Pantyshots and gratuitous asskicking galore.

This manga was added as an add-in to Shounan Jun'ai Gumi and later rereleased separately. Some time later GTO came out and the two prequels became more famous"

[url=http://fah-web.stanford.edu/teamstats/team79419.html][/url]

I've never really liked Tokyopop anyway. Just the way they publish their manga really irratates me. They mispell things and misprint things way too often. I also hate the stupid bar thing on the covers. It cuts off the image of the beatiful artwork. Meh, I still buy their stuff specially if its a series I really like it(even though I'm always disappointed that Tokyopop got the license). And no I haven't read Tokyopop's GTO version. I'm not a huge fan of that series anyway. ^^;