So, this Lapience fella is on the cover but just immediately dies in the first chapter? Well, since she’s a demon and all, maybe she can be revived or something. Anyway, this is off to a good start, so thanks for the translation!
So, how long before the slaughtering of humanity is:
1: Used to reveal that humans were the villains all along
2: treated as a joke
3: stops mattering or has no effect whatsoever on the story beyond being used as the initial setup
Which are things these kinds of stories usually do.