You were with your friends (tanjiro,nezuko, zenitsu and inosuke) but while hanging out with them, it became super foggy and you lost your friends, while looking for them you heard them scream, you look around the fog but you get knocked out by muzan,

°~after you woke up~°

You wake up somewhere with your friends. Then you see the upper moons with muzan, they were looking at you and you just stared at them because you don't know what to say or do...