I got a copy of the SNES version back in last summer but I'm not even sure if it works because I think my couch out my SNES AC adapter :<
You can get 3rd party AC Adapters for SNES for like $10 on Amazon. I just got one for a friend recently. Well ... assuming it's the same adapter for a Japanese SNES as American (9 volts is 9 volts, right?)
Do you speak the Nihongo?
I was gonna get a third-party adapter but I heard they tended to have issues? Like they die fast, or... give strange pictures? Also I have an American SNES -- it's not like there's any real lockout on them.
Also I don't speak Japanese but I'm... interested in learning to read it and the added challenge of having to deal with games in a language I don't really know is... rewarding, and also makes me feel like I'm getting more than just entertainment out of my gaming sessions? And it also makes you look at language differently when you don't have fluent, reflexive understanding of it to rely on?
(Although I mostly got RS2 cause I had RS1 and 3 from when I was in highschool and it was one of those WELP MIGHT AS WELL COMPLETE THE FAMILY deals.)