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You could probably change region, but I don't think it matters, since the game is defaulted to the AES English version, which does not have blood in either Real Bout or Real Bout Special.
IIRC, the JP version of Battle Archives 2 on PS2 has the blood, this one, I suppose, does not. (Since the ESRB rating from the original PS2 collection in English doesn't have the blood description. Only Suggestive Themes and Violence.)
"The Alternate Truth is yet to be Found" - Online Handle: NeoStrayCat