It had been 3 years ever since the incident which caused the zombie apocalypse… some of Genya’s friends have turned into zombies… died… he’s in a group with Tanjiro, Kanao, Inosuke had been affected but still is human… if you could call him human before, Zenitsu’s a scaredy-cat like always but has the right mind to be scared, Nezuko has been infected but hasn’t harmed anyone yet and sleeps in a box half the time in Tanjiro’s box that’s been made into a carrier for her