Just finished this finally.
Unfortunately, my final word could be summarized with a simple "style over substance". The production value was phenomenal. Great artstyle, smooth, fluid animations, great music, great voice acting. So what happened? No story happened. I really had to force myself finishing this, watching the last 6 episodes over the course of three weeks, always combining watching an episode with dinner. The story never managed to grab me. The first couple episodes felt like small filler stories, then suddenly we get this meeting on the Easter Isles, where all those crazy coil hunters gathered. And then it becomes som clichee-ridden psycho-philosophical wishwash, introspective all over the place, and it completely loses any grab it might have had at this point.
If I had a chance to change things, there´s two main ones: 1.) Make this a 26-episode series. We needed more time with these characters to really CARE about them. Especially those coil hunters at the end deserved more time of their own. 2.) Better handly of plot progression. A story needs to start strong, but it needs to get stronger at any given moment. This anime had a great first episode, then got reaaaally boring with its ghost arc, and never really recovered from there. And the showdown at the end didn´t feel grand at all, even when the bad guy said "I´ll make this planet into a lifeless void!" where did that come from? was what I thought.
It sucks when such production quality is met with such a lousy story. Someone should have given Ajin this production team.