One of those rare instances where the anime adaptation is actually MUCH better than the manga. The manga is basically unreadable. It's incredibly hard to follow, and makes no sense. It erratically jumps around... It's just a very hard read, to say the least. I would go back and forth between the same few pages trying to figure out what was going on before eventually giving up. On a positive note, the art is pretty good. It's not ground-breaking by any means, but is rather nice.

Watch the anime first! The manga will make you not want to watch the anime, and you will be missing out.