It was you and tanjiro vs muzan you both was very injuried but you two never give up you and tanjiro continue fighting muzan and muzan says

Muzan: hahaha!! You two demon slayer will never defeat the demon king!!!

Tanjiro: alright come on (your name) we have to fight him we can't give up!

It's only up to you and tanjiro to fight muzan will you die or live?