I read it a while ago, and I thought it was interesting. I'm not sure how I'd feel about it if I read it now because that was like, what, over a year ago? Maybe? I was less critical about the manga I read back then.
From what I remember, I really liked the setting and art. I thought that the first chapter and the chapter introducing Nanashi were interesting. Aside from the pretty standard shonen action stuff, there were some cool moments.