I didn't think it was necessary to the walkthrough but I would glady explain how to obtain the DLC to anyone that wants to play this game.
NOTE: The Asia Version is Cheaper than the Japanese Version yet they are the exact same game. They both unlock achievements so If you don't want the Japanese case I'd say purchase the Asia Version.
If you own a Japanese Tag skip to step 3
I suggest using a translator
Step 1: Make a gamer tag here
http://www.xbox.com/ja-JPStep 2: Its the same process of making the gamertag you currently use. For my Windows Live ID I just used a gmail account I already owned.
Step 3: japan-codes.com used to be the cheapest place to get Japanese Microsoft points but sadly a 1400 points card is now $28.99 not $24.99. If you use the japan codes site remember it's one guy that emails you the codes so delivery time may vary but I have used this site and love its service. You may read more about it there.
Point Cards in Japan are 1400 and 3500. So yeah a bit of a rip off for other countries wanting to buy them.
I don't know if the UK can use the japan codes site or not.
Anyways feel free to search other sites if $28 its too high as you may find a cheaper one.
Step 4: Using your Japanese tag on your console just redeem your points as normal. The DLC is here
http://marketplace.xbox.com/ja-JP/Product/%E9%9B%BB%E8%84%B3...