My guess is that the knockers have assimilated into humans bodies, laying dormant until Fushi stops spreading his roots, which will plunge the whole world into chaos in a few chapters.
@ninjadork
I agree, this was a really solid way to introduce G U N, the most natural progression i've seen yet. This series is looking quite good, but I feel a bit sad that it's only 3-4 chapters per year.
Just realized one benefit of the curse would be that you are always completely sterile, and can never get any kind of infectious disease. But if that was true then the gut bacteria would also die, meaning digestive issues and potential malnourishment. This does however depend on whether the...