Tutorial:
First step:
Make a new profile on your Xbox 360 console.

Second step:
Go to "System settings" then "Console settings" and change your "Locale" to Japan.

Third step:
Join Xbox Live and make a new account with any email as long as it has @jp.com at the end, be sure to have date of birth 18+, then follow the process from there.

Fourth step:
Download the game demo with the purple dragon (MHF 3) and open after downloading.

Fith step:
Click on the red bar and write down your 48 hour code!