You're a Hashira and arrive at a scene to see Tanjiro, Zenitsu, and Inosuke, and in front of you is Akaza, and Rengoku's bloody, dead body with a hole in his chest. You have to protect the three behind you from Akaza.

Zenitsu: We're all gonna die! We're all gonna die!

Inosuke: Zenitsu, stop being a crybaby!!

Tanjiro: R-Rengoku?!

Akaza: You Hashira just keeps coming, don't you? I kill one, and another pops up! Akaza laughs Hashira, become a demon and let me kill these weaklings, and perhaps I'll let you live. Also, what is your name, Hashira?

(creds to @MissClicker for the OG)