This is one of the most amazingly absorbing anime series that I´ve ever seen till now. Its full of mystery, suspense and very intriguing scenes. The plot is very fast and deep, with a great psychological development of each character, but not only the main ones, because even the ones that seemed irrelevant in the story have their own complex and interesting background. It has good music (I loved the jazz style opening) and sound effects provide the series with an incredible atmosphere that fits in every scene. The story is very tricky and it will give you more than one surprise, just imagine you could leave your body and turn into a spirit, its simply awesome.