it is most likely possible to hack the script and bust that Jappy text wide open. (And it prolly wouldn't even be that hard, considering it's as recent as the Saturn it might just be standard Shift-JIS or EUC text, uncompressed!)
Keep it up!
actually if you ever on a graphics hack find a suspicious-looking table of Japanese characters
Try a 32x32 font with 1bpp setting
Better yet, have you found any ... erm... MES files that seem to correspond to something you could access easily? That is a definite method for finding a point to start hacking.
A.BIN... sounds like the executable.
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