The thing that brings this manga down is the 'hazy' story; it's sort of a go-nowhere kind of plot and it can get confusing and vague. The characters weren't fleshed out enough, especially the main character, which was a pity. Well thats an understatement, I was actually really disappointed with the character development of the main character. There were these little hints scattered in the story that made you realise he has a darker, more complex personality and you just want to find out what he's really thinking. But the author tells the story like how you would describe a memory that you can't really remember; by just skimming the surface: gets you interested and thinking, but doesn't go into details to satisfy your curiosity. In a way, I guess it suits the manga since that would help in keeping the mysterious feel of the story.
But overall, it was enjoyable. The artwork was amazing; everything was well-drawn. Despite what I mentioned earlier about the story, it's still good. It was interesting, definitely, and it draws you in. If you like dark psychological stories with good art, it's worth giving this a try.