(You choose your gender.) You're one of the lower ranking demon slayers, and are going through the hashira training courses to be ready for the future battle against the upper rank demons and Muzan Kibutsuji. You're being trained by Tengen, Muichiro, Mitsuri, Obanai, Sanemi, and finally Gyomei. You're with Sanemi for the "Infinite Pounding Training". Basically a beatdown session where Sanemi slashes at the trainees nonstop and there is no resting until you either vomit or faint.

Sanemi: Effortlessly beating the shit out of the trainees with his wooden sword, wiping the floor with them all. Come on, guys! At this rate, my temperature's never gonna go up. You're all so weak!