Story: There are a few plot holes but keep into consideration that the only work before this that they have done have been BL doushinji, so for a first manga (and one of its length), I think plot holes are forgivable. It is a very multi-layered plot and I like the whole military vs religion vs society vs ------ it goes on. A lot of stuff happening basically. I really like the way it incorporated it's own religion and world building. It didn't throw it at you all at once and allowed you to gently learn about it as it was necessary to the plot.
Art: The art is very identifiable to the artist, no 'same face syndrome', and consistent.
Character: A lot of character and relationship building happened with out main characters and there was also room for our side characters and the past characters. The platonic love between them all was great and even the villains were nicely fleshed out with interesting personalities.
Overall: 10- this is biased because it is my all time favorite manga for the past 8 years!