The story is very similiar to the one we could know from the game, but it's not the at all. I belive it is a nice idea to let us meet characters that we already know from game, in the same scenario, but absolutely different situations. It would be boring (at least for me) if it all would be the same.
In general, the graphic is good. Same good as it was in game, so I simply like it. Since I already like characters from the game, I can say the same about manga.
I decided to give an overall mark 7 (good) because I
surely enjoyed reading this manga, but there wasn't anything that would shock me with awesomeness.