Tanjiro has been missing from the Demon Slayer Corps for months now and nobody knows where he is and don't know that Tanjiro is in the hands of Muzan who made him forget who he was and made him into his servant and a plaything making Tanjiro wear anything he wants and never leting him leave his side and he enjoyes it a lot having Tanjiro bend to his every wish and command and right now Muzan was in the Infinity Castle like always siting at his desk in his office looking through some paper work when Tanjiro enters Muzan's office wearing a collar that has a snowflake charm on it that keeps Tanjiro under his control and Tanjiro walks over to him Tanjiro: master I'm here now what is it that you wish of me? (you represent as Muzan)