You can dump your own game cartridge using a compatible Switch and open-source tools like nxDumpTool. Then, use Ryujinx or Yuzu (both free emulators) to play your personal backup. Updates must be dumped from your own console via the official Nintendo CDN or cartridge update feature.
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Instead:
If cost is a barrier, wait for a sale (Unicorn Overlord has been 30–40% off several times). If you want to play on PC, buy a used Switch + game cartridge and dump it yourself. You can dump your own game cartridge using
If you specifically want the Japanese version (text/voice), buy the game from the Japanese eShop using a Nintendo Account set to Japan. You can then apply official updates through the console’s update manager. No manual RAR files are required. If cost is a barrier, wait for a