This is the first manga I've seen that I can consider perfect.
The story is so smart and so well explained that it hooks you so fast, the next thing you'll notice is that you've reached the end of the volume! xD
The characters are mysterious and VERY interesting.
The art is simply the best I've seen.
Enjoyment- do I need to repeat myself?... MAXIMUM PLEASURE!!!
Overall- I hunger for more and more volumes