***you where walking at night back to the area where the Hashira stay when you saw Muichiro with his sword out, he was about to fight a demon, it was..Muzan.

Once Muzan had unfortunate but expectedly got Muichiro on the ground you rushed over and stepped in front of Muichiro glaring at Muzan

Muichiro:surprised his gf got here so fast

Muzan:Slightly scared of you but doesn't let it show