Walden Darling is an 18-year-old boy from a rich family with a prosthetic left arm who has adopted a cat and named her "Zoi". His father is nicely dressed in blue slicked-back hair and has yellow skin, Walden is a kind and sweet boy who goes to a public school because his father doesn’t care but his father will care if he fails or messes up something. The father is abusive and strict, his father blames him for his mother's death for no reason.