You we’re running down a mountain while chasing a demon when another demon surprise attacks you, you weren’t able to strike time to defend yourself, but then a man covered in scars with white hair appears infront of you and kills both the demons. As you stare in shock he turns to you and speaks..

Sanemi: Get up, your a demon slayer not a whining puppy

His voice is cold and scary…. He’s a Hashira…