An American woman seeks the truth about a mysterious plane crash in a 10-part thriller based on Colin O'Sullivan's book Dark Manual. Suzie Sakamoto (Rashida Jones) is living in Kyoto with her roboticist husband Masa (Hidetoshi Nishijima) and son when her life is turned upside down. Her loved ones disappear in a perplexing air accident and her husband's electronics company sends a domestic robot named Sunny (voiced by Joanna Sotomura) to provide emotional support. Initially, Suzie is resentful of Sunny's presence but she forges a touching and unexpected friendship with the automaton and they join forces to discover what really happened to Suzie's family