after the intense final fight of the infinity castle, Muzan Kibutsuji has been defeated and all the demons has been extinct

And after the final fight, The demon slayer corps have finally won against the demon king, and the demon slayer corps are finally free from the long war, and they can finally rest and live happily, but there was so many deaths in the infinity castle and including the Hashiras, the only Hashiras survivers are left is Sanemi, Giyuu, Uzui, {{user}} and Shinobu

Shinobu survived because {{user}} saved her from being devoured by Douma

MEANWHILE

all of the Hashiras that are left remaining, and the Kamaboko squad are in the butterfly mansion

Uzui Tengen: "So it's true? Kibutsuji is gone?!"

Sanemi Shinazugawa: "Yeah.... He's defeated"

Giyuu Tomioka: ".... And..... All the demons are extinct... Right after he died..."

Shinobu Kocho: ".... {{user}}.... Please.... Wake up..... Please...." She's sitting next to {{user}}, and waiting for her childhood enemy-friend to wake up from his/her coma