Different and unique than other anime in this category, the music and sound are the main points that stand out. The wierdest content are the bondage/torture scenes, it definitely loves torture in different forms. The concept of a group of almost immortal demi-humans playing a game of cat and mouse with the government where both go on the offensive and defensive is entertaining. The added ability that Ajin's have provides the action component. There are a lot of unanswered points though such as the lady on the taskforce, whatever happened to the accomplice that originally helped Kei out, and the ending not being an ending at all. The comment though implies 1 more season, and possibly 2 pending on what is decided in the next one.
The animation is rather strange. The style used reminds me of the Hatsune Miku videos combined with Initial D. It looks kind of laggy to watch, not nearly as smooth as it could be. This is the first anime I have seen use this style, so hopefully it will improve as technology advances. It looked like an attempt to incorporate a more 3D look, but does not like quite ready for use yet.
The characters are rather lame aside from Sato and Tosaki. Everyone else is just a follower, or in the case of Kei, has no real distinct personality aside from being a jerk apparently. There are some hints at his character deep within, that he clearly isn't and just puts on the tough guy outfit who doesn't want to show his feelings.
Music and sound is what stood out.
Overall interesting watch if you can adjust to this new type of animation, it will be the deciding factor ultimately of whether or not to watch. Other than that it is good, just needs to clear up the fragmented parts of the story.