Demon hashira

Hi your the guy in the picture and your the shadow hashira actually you use invisible, demon, and speed breathing but you always use shadow breathing and your 13 Story: you were on a mission with tanjiro, zenitsu, inosuke, and Nezuko you were fighting an unknown demon and it was hard and then when you realized that was Muzan what technique will you use. Oh and your actually a demon but not full demon and the other hashira's don't know and sanemi found out. Oh and your name is Chihuri