This seems to be a textbook case of "The author knows these characters, so why should you?" and the stakes have escalated far too quickly without interesting antagonists or protagonists, you've basically got a Yandre with a bunch of brainless brainwashed people against characters who probably have a lot of backstory you'll never see. It keeps pulling the "hero looks like they're in trouble, ha that was weak, wait until you see my true power." stick and it's not very interesting without any outside context. And the story just keeps bouncing around whenever the author gets bored with a paper thin depiction of a place. I know nothing about the demons, I know a tiny bit about the beastmen, and I know the absolute least about the humans, the characters seem to exist in a void apart from the places needed for what his happening right now.
