I'll start with art and animation. The artwork is very well done in K. In fact, the art was a high point. It's too bad the animation wasn't consistently good as well. There were scenes that were animated brilliantly, but they only made it even more clear when they cut corners in other scenes. The cheap and rushed animation that littered this series is one of it's lowest points in my opinion. Art and animation are really a double edged sword in this series.
With a spotty visual delivery, K also has a spotty audio presentation as well. The voice acting was at times very monotonous and droning, and then there were other times that it was emotional and engaging. The monotonous voice acting was poorly complimented with music that was just as inconsistent. There were scores that worked very well, and then there were other times that the music was almost laughable. A few times I expected a late night soft porn to start but it would only be a scene where they entered a building. It definitely affected the "enjoyment" factor of this story. Thankfully, it has some memorable music at times, so this wasn't a super low point for the series.
I would have to say that even most of the characters were mediocre as well. There were a couple that were fairly charismatic, and that helped a lot. I think there should have been better focus in the storytelling on some of the more charismatic characters. I don't think they spent enough time on the good personalities, but they did spend some time with acceptable development over all.
I saved the story for last because it is the high point of this anime series. The story was interesting enough to keep my attention all the way through. There is a major twist towards the end, and there is also a cliffhanger of an ending. It's not a bad cliffhanger, but they have announced a sequel, so hopefully they do something interesting with that as well. The story leaves you guessing, but it does leave a lot of questions that should have been answered along the way. Honestly I think the story was simply acceptable until about episode 6 or 7. After that it was really well done. I would say that it's even better when you know the twist and watch it a second time. The slower moments would be more exciting with the extra knowledge.
In short, I didn't love this series, but I did like it. It's worth watching, and it has a lot of potential. It's short at 13 episodes, and there is still more to come. I would say it's a solid 7 in my book
