Not just the art style, but the pacing of each chapters and the female characters not giving that feeling oversexualization... If someone had told me that it was an original work and not a manga adaptation, I might would had fell for it.
Who ever is the mangaka, so far I think he is way more skilled than most mangaka that works on adaption from Light Novels. I saw that each chapters are divided in 3 parts on the Japanese website, but it still feels a lot better than a lot of adaptation I've read so far.