At this point, this feels like the most viable way to get access to the game, the unfortunate part is that it is uncommon even in Japan. Is there just the one copy that we know exists? Also something to consider eventually is what if the battery in the phone dies and it is no longer able to boot up? Do they sell the batteries in places still?I'd feel a lot more comfortable possibly reaching out to Keju or someone else in the Japanese fandom with a known copy and seeing if they'd feel comfortable extracting the files.