The story continues from the Japanese SIGNAL drama series. In 2021, a limousine taxi driver causes an accident on a highway, and a high-level government official dies in the accident. The cold case investigation unit, including Kento Saegusa and team leader Misaki Sakurai, have doubts about the case. Meanwhile, in 2009, administrative officers die consecutively in car accidents. The police announce these deaths as accidents. Takeshi Ōyama believes that these deaths were not the product of simple accidents. At 11:23 pm, a walkie-talkie turns on and makes a connection between the future and past. Kento Saegusa and Takeshi Ōyama face the threat of bioterrorism.
Signal the Movie is a 2021 Japanese police procedural thriller drama film directed by Hajime Hashimoto and co-written by Kōsuke Nishi and Hiroshi Hayashi; the film is based on a television series with a same name by Akira Uchitaka and Kosuke Suzuki, which in turn is a remake of a South Korean television series with a same name by Kim Eun-hee. Distributed by Toho, it continues where the television series had left off, as Kento Saegura, Misaki Sakurai and Takeshi Ooyama investigate mysterious car accidents occurring in both past and present era. Kentaro Sakaguchi, Michiko Kichise, Kazuki Kitamura, Yuichi Nakamura, Tetsuhiro Ikeda and Kaede Aono reprises their roles from the television series, with Tetta Sugimoto, Nao, Tetsushi Tanaka, Takeshi Kaga and Tsuyoshi Ihara joining the ensemble cast. It was released in Japan on April 2, 2021.
