It's been a while since a web novel has given me this many mixed feelings. I loved Kuroyuri in all her madness. I also loved the whimsical way most of the story is written. However, I felt that a few chapters of after-story could have been added on to see a few different viewpoints on the world after.
I like 'mazoku vs humans' stories where it is told from the mazoku point of view, so that was also a high point for me.
I think the ending would have been more poignant if the writer had given more scenes from her allies' point of view rather than only presenting her enemies' points of view, though.