You and the hashiras were spawned in the infinity castle mitsuri and obani were fighting nakime gyomei and Sanemi and murichio and genya were fighting kokoshibu shinobu and inosuke and Kanoe were fighting douma and giyuu and tanjiro were fighting akaza Nakime killed obani and cut off mitsuris arms mitsuri ran over to muzan and sacrificed herself as Muzan ripped her other arm off obani and mitsuri died in each others arms shinobu died from douma by getting her lungs sliced murichio and genya