First things first. My "reviews" system is explained on a blog entry. Which can be found through my profile.
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Get a feeling this is one of the reviews that I'll be quite likely re-writing in future.
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✦Story
I'm not sure to what comment about story, so I'll keep it simple. It has this empty/depressive presentation which I'm really fond of, lot of things there contained aspects of which I can relate to. Story is vast and rich, but as an Anime viewer and as a person who isn't fond of reading nor used to it, I found story became really hard to keep track on. Eventually I forgot lot of things about story which made it harder to connect dots later on. Story era/creatures, ideas and so one were superb. The whole topic of abyss/void and main characters venture through that all pain is superb. But yeah, story gets quite a fair amount of confusion which is the cause to lower my enjoyment for the story. I really hope it will get fully adapted as an Anime. That way information would come in more ways. I also weren't that fond of such massive amount of betrayal and tragedy... was painful in various ways.

✦Art
Beautiful. A lot of was shown, whole architecture & era, character designs were superb, emotional presentation was superb, action was cool and the creatures were fantastic.

✦Character
There a lot of characters so I'm gonna sum it up in the following way. Lot of unexpected twists and things I were not fond of at all. But I grew onto most characters, even the ones I hated(still hate) and disliked. Very depressive, empty, desolate characters with an need/search/urge for hope and their adventure throughout all of it.

✦Enjoyment&Overall
I did love Anime, seen multiple times, so finally picked the Manga, lowed it the like'wise but of course I enjoy Anime more for it's colors, music, animations and emotional presence. The whole topic of Abyss/void and all sorts of strong negative feelings were my jam. I also loved the main character himself being sort of in the midst feeling desolate. Which made that even stronger was that even leaked outside so some other characters could recognize that emptiness. But as always with any sort of work eventually there comes the "good" .. where main character meets people who care, who save him, encourage, help to move and so on. Lot of strong good emotional impact from outside which also leads him towards better from the inside, which also helps him grow stronger. When starts my life "good" development, where are those fateful encounters, the motivational saviors.

Anyhow, I loved almost everything about this manga/anime. Only issue I had with this Manga was that it was eventually very difficult to understand what was going on as I forgot lot of things I had read previously. As well a bit too much tragedy. And I'm not sure how to feel about the ending.