Story:
You might think that the story is just your normal rambo crap but its not. The story might but slow to develop but it is very interesting. It also involves brain games that can make you guess what will happen next. The series are divided into different arcs that may contain 2-3 episodes but each of it are interesting.
Art:
The animation is very good given that it contains a lot of fight scenes that needs high frames per second. Those scenes are quite well done that really helps the mode of story. The blood scenes can be seen quite often so if don't like that scenes you might want to skip this anime. The background are well made and given that they go different places, the quality did not drop.
Sound:
The sound is also good. The ost's are great and it really helps in setting the mode. You can feel the excitement when needed and it really gets you going to watch more. Even in the preview track, the sound is really great that it will play in your head a number of times. Honestly, I always look forward to the preview track every time I watch.
Character:
The character development is discussed in the series. The lead is very interesting and really gives an impression. The sub characters might not be very interesting in the start but as the series goes on, you will learn a lot about them.
Enjoyment:
There may not be a lot of fanservice but you can still find this series interesting and enjoyable. The story is good and the scenes are intense. I sometimes stop watching just to kill my over excitement when watching the series.
Overall:
Overall, I will recommend this anime given the ideas I discussed on the top. I'm sure you will not regret this because it's a complete package anime.
