Oh, good. A creepy sis-con, keeping his chicken sister till they find a cure. Can't have an apocalypse story without at least one incestuous fukboi keeping their turned family member.
What if they keep feeding the chickens that were originally female to get eggs to feed the dome people? But that's only if there are differences in their transformations.
That's bullshit, there's no way that dude entered that room and didn't see Nee-san the moment he opened the door. It's official, this manga is worse than Deathtopia.