"In the first age, in the first battle-" Wait no, that's the wrong kind of testament! - Author ( Photos used in the story are either from the Wiki or I googled it )

Betrayed. People say, along the demon slayer corps, there's a slayer that's a demon...? ___{discontinued} ·??? x Tanjiro ·idk I'm bad at writing descriptions

(Discontinued!) In order to save his sister Nezuko that turned into a demon. He made a deal with Muzan. "Please turn me into a demon... Instead, please change her back to humanity... Let me suffer for her!" Muzan agreed with their deal and let Tanjirou drink his blood. Since then, Nezuko to revenge, meet Giyuu, and slowly become a powerful swordsman... "Nii...-san?" The next time Nezuko saw her brother was battling with the Upper Moons. To her surprise, however, Tanjirou still shows signs of human emotion and thought.

[ discontinued ] Tanjiro went to sell charcoal for family and came late because he also help some people. A man offers tanjiro to stay the night but tanjiro smells a strange smell from home. Tanjiro goes home fast and finds a man who calls him self " muzan kibutsuji " The man tells tanjiro to become his Oni in order to save his family. Tanjiro accepts and becomes a demon What will happen to tanjiro next?