Case Closed, known in Japan as Detective Conan, is a long-running Japanese manga series written and illustrated by Gosho Aoyama. First serialized in Shogakukan's Weekly Shōnen Sunday magazine in January 1994, the series has become one of the best-selling manga of all time, with over 270 million copies in circulation worldwide. The story follows Shinichi Kudo, a brilliant high school detective who is transformed into a child's body after being poisoned by a mysterious criminal syndicate. Adopting the alias Conan Edogawa, he continues to solve complex criminal cases while secretly investigating the organization that shrank him, all while living with his childhood friend Ran Mouri and her bumbling private detective father.
The manga masterfully blends intricate whodunit mysteries with an overarching thriller narrative centered on the shadowy Black Organization. Aoyama's work is celebrated for its clever plotting, forensic detail, and a vast cast of recurring characters including rival detectives, FBI agents, and fellow victims of the organization's experiments. The series has spawned a massive media franchise encompassing an ongoing anime television series, animated feature films, video games, and live-action specials, cementing its status as a cornerstone of modern Japanese popular culture.