Even has English subtitles
Dark Souls 3 launched in Japan today and a loophole has been discovered allowing players to purchase the game on Xbox One regardless of location.

Better yet, the Japanese version contains an English option for all text and subtitles.

As spotted by NeoGAF user bidguy, Xbox One players can acquire the game using the following five steps:

Make a new account based in Japan.
Purchase Xbox credit from the Microsoft Store in Yen.
Buy Dark Souls 3 using a Japanese address. Any Japanese address, so long as it's real.
Now set your Xbox region to where you live.
Download the game and enjoy!

Several Redditers have verified that this not only works, but that all the text and subtitles are available in English, should you set your region to an English-speaking territory.

There's a very real possibility that Bandai Namco or Microsoft could revoke access to the game, so it's not fool proof. Plus there's the risk this trick could stop working between steps two and three, leaving you with a lighter wallet in lieu of a full game's worth of Xbox credit on your dummy account.