Well, in the US version, you can tell he's killing Knights of Christendom, which would be the Templar Knights(which really existed.....& supposedly still exist). I thought it was pretty much a revolt against the crusades, atleast, that was my impression. I have the Japanese version, & I haven't noticed anything different about it that I can think of right now. I think the last area in the game, is based off of grease & Socrates, but I could be wrong. There's that one area, where people pretty much worship sex & alchohol right before the library place.
Oh yeah, & that'd be great, though I doubt it'd happen, if they got the right to publish World Heroes, & King of the Monsters 2 for Turbo. I'd eat that up in a heartbeat!