Kazunobu Chiba works as a police officer in the Tokyo Metropolitan Police District, directly assisting Inspector Juzo Megure. His duties focus on supporting criminal investigations, often alongside colleagues like Detectives Sato and Takagi. He shares a long-standing bond with traffic officer Naeko Miike, stemming from their childhood and extending into their current professional partnership; they frequently collaborate on cases. Within documented media, including the events of *Lupin III vs. Detective Conan: The Movie*, Chiba participates in law enforcement operations. This includes responding to the theft of the Cherry Sapphire gemstone and aiding investigations into related international criminal activities portrayed in the film.