Signal (Japanese: シグナル, Hepburn: Shigunaru), also known as Signal: Long-Term Unsolved Case Investigation Team (Japanese: シグナル 長期未解決事件捜査班, Hepburn: Shigunaru: Chōki Mikaiketsu Jiken Sōsahan), is a Japanese police procedural television series starring Kentaro Sakaguchi, Michiko Kichise and Kazuki Kitamura. It is a remake of the South Korean drama of the same name written by Kim Eun-hee and aired every Tuesday at 21:00 JST from April 10 to June 12, 2018, on Fuji TV.A sequel film, Signal the Movie, was released in theaters in Japan on April 2, 2021.