Deal DetailsLast Edited by doop August 27, 2015 at 01:05 PM
Make sure you are signed in and on the Japanese marketplace. If not, change the country by hitting the current country on the very bottom left and select Japan. Now you can click the buy/download button to get the beta
I would recommend doing it in this order:
1. Go to xbox.com and log in
2. Change locale at bottom left of page to ?? (Japan)
3. Open up OP's link
4. Download/Buy the beta. Make your best guess to which button is which. They should be similar to buying a game on English store page.
Once the beta is downloading or installed after the above process, delete it and then download again from your preferred marketplace/store, it will show up there as purchased. This is to get your in-game preferred language. Because through above process the beta in-game language will be Japanese.