bear with me then - whilst I look into it - I had 256 giveaways running - so it is entirely possible that at least one or two were screwed up somewhere :)
might take me a couple of days to decide what to do - or even to find which store I got it from :(

Okay - found that it comes from the Indigala Anime Sugoi Bundle - that is the code listed for me on their website - so I am afraid, should you still want the game, that you will have to wait whilst I submit a ticket to indigala to find out why they have supplied a bad code.
Okay?

okay email sent to support - we will see what they say - and you are correct, I just copy pasted it myself from my indigala account and it is indeed invalid - so please accept my appologies on Indigala's behalf :)