I don't think you'll have much luck on the english speaking internet, I think your best bet is to check japanese auction sites or ask around in unexpected places for people who might have a copy to upload a disk image.
(of course if you're looking for no nanakorobi yaoki [which I don't think you are?] it's up at http://satoarchives.com
Ah made a mistake there, I did. I'm searching for World Tour!
I'm trying to find it on Japanese auction sites, but no luck there, game's rare. And I don't think even if I find a Japanese owner they'll want to rip it, Japanese copyright laws are wack
Can you update this thread if you ever have any luck? I'm intrigued by all this