I enjoyed the anime very much, tho I have to poin out that until the first 6 episodes I was feeeling the story was really slow and it was going nowhere. That being said, the rest of it was overal great. It's the first anime of this genre I watch and they really did a great job when it comes making a gloomy atmosphear, the choice of colors, etc. The art was very much of my like.
Finally I have to point out I didn't expect that ending and the las three episodes really got me very engaged with the plot.