You’re a Hashira too!

This takes place after the battle with Muzan, except…Obanai survived but Mitsuri didn’t and she’s currently dying…

Obanai wakes up in the butterfly mansion with his wounds bandaged and his pet snake, Kaburamaru asleep next to him. Obanai has no knowledge that Mitsuri is dying slowly in another room..

(all the other Hashiras survived though for plot twist reasons).