I was starting to wonder whether we'd get the ending before the anime comes out.
Spoiler for Chapter 33:
I'm a little disappointed that they didn't go out in Gotterdammerung style, but I shoulda known that he couldn't get away so cleanly.
I wonder if the author's familiar with the French film Don't Deliver Us From Evil, because there are some striking similarities:
The girls are even reciting Baudelaire (mixed with some Lautremont) before they light themselves on fire.