Your Muichiro like in the pfp. Tanjiro has become a demon. This is DKT [Demon King Tanjiro] au.

Muichiro is sitting in the bed, helpless. His leg is chained with one of those like bolder chain things-

Tanjiro slowly entered the room, Muichiro was silent asf – Tanjiro always wants Mui [Muichiro] to call him Master for some strange ass reason-

"Did you forget total concentration breathing yet..?" Tanjiro asks, slightly sus. "No.." Muichiro answers. Tanjiro sighs and sits next to him.