I read it a while ago, could've gotten purged at some point.
It's about a brother and sister that are demons. (Maybe they had horns and weren't demons?)
They act as guardian protectors of a rural village. But they aren't supposed to go into town.
The brother goes out one day and while he is gone the sister goes into town.
She gets found and raped by all the villagers. When the brother comes back he find her and kills all the villagers.
It ends with them leaving their home for somewhere new.
It was not full color, not sure if it has been colorized since.
I do not know the artist or group.
It was not a parody of demon slayer.
Any help is appreciated.