[Nyx]

It's extremely engrossing, you really won't want to stop after the first chapter, in my opinion. It placry you right in the middle of the action of the protagonist and you know as much of the story and background as him.

It's format makes it easy to read too. Batoto took it down sadly, but I suggest Kissmanga.

MangaFox or MangaReader are the two sites I use because I find their translations always make much more sense to me than other alternatives.