Im not much of a fan of this genre but Kurozuka is an exception.I coudnt stop watching it until I completed the entire 12 episodes.
The story is presented in a series of flashbacks and hallucinations of the main protagonist,which honestly is a bit confusing most of the time,and there are lots of parts which I simply cannot understand.Also this anime has a lot of unexplained loopholes which are quite glaring at times.
To sum up,this anime has a very good plot which couldve been scripted better and the animation is very good.If you plan to watch this,be prepared to break your head over a lot of scenes where you will feel completely lost :)
