I particularly loved this because of the intro, and how it is actually kinda sorta almost-but-not-really verifiably based on Japanese anthropology. It's kinda like (or rather, I pretty much assume it is) the private fantasy of the author, generated by taking the starting point of Japan's legends and mythology (about Oni), traced back realistically into recorded human history, and then from there converted back into fantasy.
I don't think the yuri portion itself was poorly executed in any way, either. Basically, what it comes down to: I'm cheering this author on and hope they can turn this into a nice and long series.