Go to Console Settings and go to Language and Locale.
Change the Locale settings to Japan,
It should disconnect you from xbox live. Just reconnect.
Go ahead and make an account. Put Live Enable.
When your at the Email Address part just put JP at the end.
EXAMPLE @ JP.COM
Then put in your info after that. When your at the security question, click the first bar and put an answer you will remember. After that wait for it to create your account.
Then just go through the gold info and if you haven't tried out the 1 month trials, it will let you try it.
On the dashboard, you should see the MH-Frontier if you don't scroll through the pictures.
Download the trial and when it starts up it will bring you up to a browser
and click the red bar. It will give you a 48 hour and a useless code.