Honestly, when I think about this story, it reminds me of Elfen Lied a LOT. Humans are responsible for the mess, yet they shun the consequences.
Anyways the story is very engaging. It keeps you hooked from start to finish. There are a a lot of action scenes but also great backstories.
Because there are backstories to practically all important characters you get a feeling of understanding who they are. There are some interesting personalities as well. Mysterious, sadistic, childish, you begin to realise how they came to be in such a way.
I felt the artwork was well drawn and got any point it wanted to across so I really have no glaring complaints.
Overall I loved the story, I loved the characters, I enjoyed the artwork, and since I feel like this is similar to Elfen Lied ( which I loved as well) I'll say I had a blast reading this, too.