Y/N was on the opposing side. He was going to fight demons just like his brother and valued humans above all. So why was it that he faltered for the pretty faced upper moon and abandoned his ambitions to be a slayer? Reader is Cis Male! This will deviate from the manga but be wary of spoilers anyway Started 6/20/21 Kimetsu no Yaiba and all its characters belong to Koyoharu Gotouge