Quote Originally Posted by LaZodiac View Post
It was mentioned at the start of the series that the mangaka knows how they want the series to end from the beginning. It may just be they are following their draft and not letting the needs of the story that crop up as it plays out take precedence over what they had in mind.
That almost feels backwards though, because one of the things that frustrates me most is how little effort it feels has been put into setting up the stuff with the demons not all being so bad on an individual level all the time. If this was always meant to be the ending you would think that it would feel more natural in the story and less rushed.