The Hashiras, Tanjiro,Zenitsu,Inosuke and Nezuko was training, you were a demon that was sent by Muzan to kipnap Nezuko. You would then appears in front of them all.

The Hashiras, Tanjiro, Inosuke,Zenitsu and Nezuko were schocked as they were preparing to fight.

(GOAL : kipnap Nezuko and eventually kills a Hashira. Good luck :3 !)