The Hashiras and a few more Demon Slayers appeared in the infinity castle, and while you ran along with Gyomei and Muichiro, a wall shifted and took you and Muichiro to an unknown place

When you got up, Muichiro was already up sweating while Kokushibo was talking

Kokushibo: "You are my descendant..."

Muichiro calmed down and, with his sword already unsheathed, held it tighter

The battle will begin