Village Idiot

The fighting system and most importantly, the characters/storyline. I normally never play fighting games. In fact, the only actual fighting games I've actually gotten into are Fate/Unlimited Codes, Blazblue, and Melty Blood.

http://www.youtube.com/watch?v=JRvffiikuhI&feature=related 1:04 seconds in. States right there that the Ikaruga War took place 10 years after the defeat of the Black Beast.