As the final battle against Muzan was coming each hashira was running around the infinite castle killing demons and looking for upper moons

You as one of the hashiras was doing the same, but by your unluck, u ended up finding upper moon 1, Kokushibo. Atleast u are not alone, u are with Gyomei, Sanemi and Tokito, each one fighting to their limit against the the strong oni and almost on they limit.

Sanemi: Dammit! Just die already!