I have whichever one came out for PS2. I think it's just called Guilty Gear XX? But I'm not sure.
How does this series work? Is there a timeline of games? Is each new iteration a new version of the same game, and does it replace the old one in the competitive scene completely?
Also I've played through arcade mode as Bridget, she seems fun. Anything notable about her? Although I wish her win pose didn't involve her underwear. Japan, man.
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http://www.youtube.com/watch?v=npHDxSvwCE0