So before starting the review i'll say this:
Go and read the manga in only 2 episode i understood how shitty is this adaptation plus the art is god tier
Character - 1
They skipped 60% of the first manga so it's normal that you wont understand characters and you wont know them cause their introductional sequence is never shown
Sound - 6
There's nothing to say about music / sound in general it's just ok
Art - 5
The cgi isn't that bad and honestly it's kinda need because even if they cut out like 60% of the story here on out we'll have many many fights and tbh it isn't that bad compared to other cgi anime
Even if my god the pose of the cgi model are so bad they don't move even when they are fully visible on screen and you know that are supposed to have some kind of animation in that moment
WITHOUT COUNTING THAT THE ART IN MANGA IS FUCKING GOD TIER
Enjoyment - 2
For all the reason above and the story portion (that contains spoilers for the manga that is awesome go read it) i just can't like this series
Story - 1
You know they just skipped like 60 chapters where SPOILER ALLERT
Ruska looses her lover to the slaves in cestus's first slave camp and starts to hate slave boxers
Nero's character development
Ashley
Cestus training and techniques
And so on