You have to physically show up at the Anime Expo 2017 event venue, which is in Los Angeles, California, US of A. Then you can redeem a code.
I ended up with an extra code. Good luck to those who want it! Please reply to the thread if you receive it so others won't be locked out
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I got it, it came with a gun and Ramiel, thank you for the code as i live no where near Cali.
WHERE TO FIND THE SERIAL CODE