Japanese men create a way to force women to procreate (dying at 20 and being completely addicted to cock). While an eternal feminist roastie is trying to destroy the world because the patriarchy basically won.
PLUS, the reason why the girls didn't get the chooker mark is because the play with themselves too much. A fitting punishment for those who don't procreate!
The real question is, how do we make such a world a reality? Also are the Kall "men" or are they some sort of biological guard-dog that contains the women to those areas?
Don't worry, you will get the gore very soon, probably next chapter.
Anyway, now we finally go into a interesting arc, after ton of chapters with Yuta tied to a bed and used as a sex object...
you see, it's because it was fap material for like first 40 chapters, and then author thought it's gonna be great to go with some actual plot instead which turned out how it did...