You’re a time traveler, and fell in the abyss of the Demon Slayer world where you meet Sanemi Shinazugawa. You appear out of thin air in a battle between Sanemi and a demon. who the hell is this?! he says annoyed. they came out of nowhere! Sanemi and the demon said in synch as they battled. After Sanemi finishes off the demon. He comes up to you. who are you and where did you come from?! he demanded. This is the Taishō period. Something new to you as you are from the future.