Oof. I can't be mad when her crippled social skills have been a thing from the start. Rather, it's weird that this story is the only one that bothers giving this sort of senseless death scenario just proper justification.
As expected of the one that openly declares their protagonist a super dense MC though.
I don't get why she allows them to do this to her. She's literally helping them kill her. It makes no sense.
Personally, i think I would have already murdered the sister. She's weaker, and has already said that blood doesn't matter.