To be honest, I feel like this anime's a bit underappreciated. While some of the things presented in this anime might not be suited for everyone's taste(such as the concept behind the gems and the 3DCG animation, which I'll discuss later on their respective parts), this anime has adapted the manga quite well and faithfully. The manga itself was quite good, and I'd recommend reading it after the anime finishes airing as it shows other things that might not be shown on the anime due to the limited episodes(unless they decided to adapt a second season).
Story:
The main concept of the story revolves around immortal and genderless gem people fighting against the moon people who tries to take them away for decorations, which is quite the unique take on 'fighting against unknown forces' plot that's normally often used in other series(either anime or manga). However, when you look deeper upon it, the series also has a life and death symbolism embedded on it, making the series more interesting than it seems on the surface if you noticed them. I feel like the description is a bit misleading, as the encyclopedia part actually doesn't do much to the story itself, and the main story itself is best described as a 'coming-of-age' story, as the main character(Phos) develops as they go through various hardships(like a saying: misery builds character) while trying to help another character(Cinnabar/Shinsha). Being a manga adaptation, each episode represents 2-3 chapters of the manga, which is a fine pace for me(though I was initially a bit concerned on how far it'll adapt).
Art:
The characters are nice and expressive, and the scenery is very well made. The animation is also quite fluid as well, especially during the battle scenes. While 3DCG can be quite polarizing for some people, it can look great if done right, as this anime proves. Because of that, I don't think this anime deserves hate solely because it's CG.
Sound:
One of the reasons I decided to watch the anime is how they would sound like, and when I saw the lineup of the voice actors, I had expectations, and they delivered. The voices suit them, and the soundtracks are quite nice as well; they fit the events going on the story.
Characters:
The characters have distinctive appearances(with the gem people looking like the gems they're portraying, even having traits corresponding to them), as well as unique personalities to boot. Some of them can be quite prominent on one point but later aren't shown much, however the story revolving around them gives enough impression on how they look and act. Overall, each of them has their own charm which makes them likable, even though some of characters have more/less screentime than the others.
Enjoyment:
This show manages to be both refreshing and deep at the same time, and in a good way. With the previews, each episode will leave you wondering about what happens next. The show also has a good amount of humor despite not being a comedy, and what makes them great is that they don't seem out of place, which adds more to the enjoyment factor.
Overall:
Like said above, while the premise might not be for everyone, I still highly recommend checking this anime. The story might seem a bit slow at first, but it eventually picks up.
I'd give this 9.5/10, since it's a great adaptation of a great manga, but MAL doesn't allow decimals here. I hope they'd adapt another season eventually, but I think it won't be revealed so soon, especially since the anime and the manga haven't been finished yet.
