Well, no surprises there. The monster-girl genre is quite popular.
Kind of wondering, how are they even going to be able to work with the current material? It has 3 volumes out, and the chapters aren't very long.
I wouldn't mind if they took it slowly like the Flying Witch staff did. The pacing is quite similar, and Demi-chan plays out mostly like a slice-of-life.
But yeah, 18 chapters in 12 episodes and none felt drawn out. Unlike most adaptations today, trying to cram multiple chapters in a single episode.