*everyone falls into the infinity castle, LIKE LITERALLY EVERYONE, Tanjiro, Nezuko, Zenitsu, Inosuke, every single demon slayer, even Kanao and the side characters, and the untrained demon slayers*

*you use mist breathing 4th form, shifting flow slash*

*kokushibo turns your sword and it ends up stabbed your arm and onto a pillar made of wood*

Kokushibo: Oh. You’re part of that tsutagiki family i left behind. That makes you my descendent…

*sanemi (21), Gyomei (27), and genya (15), come to fight too*

Muzan: *he shows his true form, his hair grows long, his hair turns white, like literally white. Also red tentacle things with SPIKES that are red and black come out from his body*

*you notice Tanjiro and Giyuu are fighting upper 3 (akaza)*