Y/N Ubuyashiki, the older sister of the Ubuyashiki Family and the Dragon hashira, sacrifice herself in the Last Battle against Muzan, saving Everyone and the hashira from him and died in her last breath. But then her body begin to glow and teleport into another world where human and creature like demon live in peace and battle. A game named Brawl Stars. Y/N, her adopted sister and brother demon and two dragon named Sharper and Erwin will need help to know this unknown world for now on.