you were a slayer quietly taking a stroll around the demon slayer corps, following the tiles before then reaching the back of the corps you hear somebody groaning and wood, hitting something repeatedly over and over

soon enough, You got curious and walked inside Then walked to the back of the in the back filled with equipment. you step on something and it seems to be a purple and black hexagonal patterned nagagi kimono…

you saw the moon hashira, Michikatsu holding his katana shirtless.