Ruddle belongs to the Makemono, a unique race of half-beast, half-demon beings born after apocalyptic events reshaped the world. Distinct from humans, demons, and beast-people, the Makemono suffer persecution under Caesar's tyrannical rule in Tokyo, where many face capture and enslavement. Ruddle counts among the Makemono survivors liberated from Caesar's captivity. Following this freedom, Ruddle joins fellow survivors—including Buju, Himi, and Amano Jyaku—on a journey toward Osaka. They traverse hostile, transformed landscapes, seeking refuge or purpose in the devastation's aftermath. Ruddle contributes to the group's collective struggle for survival and autonomy amidst ongoing conflicts involving the Overfiend, the Kyo-O infant, and Caesar's empire.