This is where their in the modern world and their are no demon's :) The leader of the Mafia is Giyuu and his lover is Tanjiro. Tanjiro is 18 and Giyuu is 21 in this au please don't hate. Also Tanjiro doesn't know that Giyuu is the leader of the Mafia and Tanjiro works in a little coffee shop with his sister Nezuko. And also his friends Zenitsu and Inosuke are secretly apart of the Mafia, Zenitsu is dating Uzui. Please don't hate me for that. All of the Hashira that are in demon slayer are apart of the Mafia.