The artwork is also amazing. Feels like watching a movie not an animation. I never saw something like this before. The lens setting make it feels like it's not a drawing, it's not anime, it's a movie. Catchy back-sound also make it more live! Like every back-sound is really suit every scene. The coloring itself also "uncommon". Feels like the animator give some "effect" inside. Talk about the story, well it's pretty stagnant yet focused in one mater. I love the consistency even though some of the story left curiousness like why there's only 5 kings while it says originally has 7 kings. What happened tothe other kings? Why they don't have any successor and ext that need to be told in my opinion.

I also curios about the death of the green king. Why he can't be alive again while Weismann can be safe after the accident? Will it has the 3rd season or will explained more in an OVA? Who knows.

In conclusion I love this anime and recommend you to watch it!