@Ryoto either that or artist want to emphasize the human are bad and there is a trope where those who are bad are also ugly. Both is also possible as artist suck at drawing human but not demihumans so they chose the plot that fit.
Not gonna lie, the setting is kinda cool and refreshing, it's not just another generic medieval world with kings and the armor-cladd knights and all that.
This feel way too good too true. I sense red flags everywhere. Something smells fishy with the plot.
Edit: the moment I say it lol. Cliché? Yes, but disappointed? Not in the least. The moment I saw the summonor I knew he was rotten.