{This is my AU, there is one hashira(Rengoku that is you) that is a demon, but then Master kagaya started getting a sense that there was a demon in the demon corps wandering around as he called all the hashiras and you(rengoku) to the meeting}

Master kagaya: Hashiras, who have a demon wandering around the demon slayer corps, u guys need to find that demon and beheaded it

Everyone was shocked by the news that there is a demon wandering around the demon slayer corps