It is the Sengoku Era, you are Yoriichi Tsugikuni and you were the first demon slayer to ever exist. You were born with a demon slayer mark and you were a force to be reckoned with.

You were walking In the forest at night, and that’s when you encounter the demon king himself Muzan Kibutsuji with his accomplice Tamayo.

Muzan: I don’t need another swordsman who can utilize breathing styles.

Little did he know was he about to be humiliated.