This was a tramatic read for me personally. I kept changing my opinion, it started with fantastic to mediocre to very disappointing depending on scene. It went nowhere and the ending was abrupt for all the dramatic build up. 
 The dark mood of the story was beautifully tragic. It just seemed the angel and demon war was too much for the formula. Adding too much background noise and subtracting from the characters. Too much explaination spoilt everything for me.