Beast of Reincarnation begins in a post-apocalyptic version of Japan, a land fundamentally changed by widespread corruption and inhabited by monstrous creatures. The story follows Emma, ​​an exile branded as the Cursed, and her faithful canine companion, Ku. Together, they represent a possible path to salvation for the remnants of humanity scattered across the devastated lands. Their journey takes them through a world where survival is a constant and difficult test.