The story is great, the complications, the climax, it is all interesting and can be enjoyed well. However, in the resolution, or the ending, there are still some questions left unanswered which dissatisfies some of the watchers. It is possible that they will answer it in the second season if there is any.
The art is great, the character illustration is realistic and well drawn. The characters in the story is also interesting as some of them are not just ordinary humans and are spirits, and it adds some interests to the anime.
I enjoyed the whole story except for the ending part, because it's very teasing for me and I don't feel satisfied by the ending.
For the overall rating, I think it's a great anime. But there are some problems on recommending this kind of anime, because of the fan service, I can't possibly recommend this anime to everyone. Even so, I think this is a great anime which you should watch :) This is my first review so far, forgive me if I made any mistakes. Good day~!
