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.
UMBRELLA CUCKING
Also guys chill out. This is a perfectly enjoyable semi-lewd comedy manga with obvious parodies of hentai tropes, of course it's going to have some bullshit situations played for laughs. No need to take the character dynamics too seriously. We should all be cracking jokes about...
@FlamingSquirrel
There was a reveal in Chapter 20.5 with a few terrorists with what looks like a bunch of giant chicken eggs, and a male half human half chicken mating with a female human woman to produce offspring implied to be the first of the chicken shifters. Shit I'm starting to see...
The buildup in this chapter is so obvious it hurts, after the whole thing about trap-kun debating the ethics of killing giant murder chickens, the next chicken to get close to actually killing the protagonists will be revealed to be trap-kun's father.