I got this game by mistake and well, I'm pleased that it was a mistake.
The game is not bad at all. The best part is the combat system. Since it's an action RPG, you can slash your enemies and summon demons to help you out. You can also control demons and play as them if you select the solo option. The main character also carries a gun with special bullets (fire, wind, ice, etc).
Fusions are present too, as the Devil Chart is.
As far as I have played the story doesn't disappoint. You are a young detective that has received the power of summoning demons. You must investigate the disappearance of a young girl and uncover the truth.
The environments aren't in 3D, I don't know how to explain it, but if you have played Residen Evil or Final Fantasy IX, that's how the stages and areas are like.
So my advice is that if you are a SMT fanatic you must buy it. It's a good change from the turn system games.
Now lets hope for the next chapter to arrive to Europe!