I found a disc-only Christmas NiGHTS at a flea market last Saturday and noticed some Japanese text in the game (not all, just some lines, the menus were mostly English). I looked online and noticed the North American disc art is red and green while mine is black and white.

Which version is this, and does the fact that it plays on my Saturn (a thrift store find) mean my system has been modded?

Thanks in advance.