I didn't know this game (and its predecessors) existed until I met with an old friend of mine. He was playing it like there was no tomorrow. He explained it to me and let me play. Sadly, I couldn't play more than 3 days in-game because I was suffering from a mild headache and playing was making it worse. So I let my friend play while he was telling me the plot. I thought it was very intriguing and interesting.
As I don't have the game nor the console to play it, I did the second best thing I could... I started to watch the anime.