Story: 8/10. We have the main characters,Hiraga and Nicholas, and they need to investigates the "miracles" around the world. The first arc and thrid arc are puzzling and even frightening to some degree. The second arc is more character development than mystery but is good anyway. The episode five and the ending may have you think that they are filler but nope, they are interesting and you have to consider.
Art: 8/10 The art is very good overall despite some background characters in some episodes.
Sound: 8/10 The soundrack is good, I love the opening and the ending is fine. It have perfect music in tragic or tense scenes.
Characters: 7/10 At first I don't like the characters very much. I was feeling that they will be ending undeveloped but i was wrong in the second arc and the ending. The side characters are fine and the many are not useless despite some are just plot device. The main villain is interesting too.
Enjoyment: 8/10 I enjoy the anime overall despite how fast end the second arc.
Overall 8/10
The anime is a good example of mystery, thriller and tragedy. If you are looking for this type of anime i highly recommend you!
