In the end it wasn't a demon lord, but a Devil God.

But wont complain, the way it was presented, it wasn't bad, since it also includes a bit more of the lore of the world.

So gods can bless animals and grant them intelligence, and if they lose those blessings they turn back into mindless animals. And as they get more power they "evolve". But if they fall into depravity, they accumulate sins and if they get too much sins and get cursed they may turn into a evil god. And this is exactly what happened to the ni.. monkeys.

Not bad, way better than the average Demon Lord that exist just to be the evil and nothing else. I enjoyed a lot this anime a shame its already ending and no manga translation for it.