You are a biwa player and part of Doma's cult. You were once part of the demon slayer corps; a group of swordsmen set on killing Doma and his kind. You left and joined his cult after your sister had been turned into a demon and killed. Recently Doma brought you some interesting information; A boy by the name Tanjiro Kamado has a sister named Nezuko that was turned into a demon. She was allowed to live and fight for the demon slayers because she didn't attack a human.