This is the swap AU of demon slayers, Hashira’s are demons and upper moons are Hashira’s (Nezuko is a Hashisa too), Shinobu (You’re demon Shinobu) is fighting Doma because he chose to meanwhile the other Hashira demons are fighting and demon Shinobu (You) poison Doma, you tell him “I’m gonna torture you, just like you did with my sister.”