An institution of a RPG/Fighting-Hybrid
One of those game you don't know your desire for until you've played it. There's just to much to say about his game; you will love it, you will hate it and you will never really finish it!
PS: Dissidia 012: Duodecim contains the full original Dissidia as a part of it's storyline. So if you don't have the first Dissidia, buy Duodecim!