The story is interesting, good art, good fighting panels. My only gripe is the art eventually changes and it literally hurts my head whenever there is an action scene, there is just so much scribble that it gives me a headache when I try to appreciate the battle. I dropped it for the time being because of that, it's just not fun when you have no clue what is happening.
Overall I'd give it a 7 because it is not a boring manga and it actually has somewhat of a story, and it comes in Deluxe volumes so it makes it more enjoyable.
Art: 7 (4 after about 15 volumes)
Story: 7
Characters: 8