A former TV presenter is murdered. On the same day, two police officers from the Metropolitan police Special Mission Task Force, Sugishita Ukyo and Kameyama Kaoru, are guarding a female Diet member, Katayama Hinako. The pair identifies explosives and saves her life. From the clues left at the scene, Sugishita builds up his case and finds a connection between the murder of the TV presenter and the attempted murder of the Diet member. During a painstaking investigation, the savage murder case of a young overseas volunteer five years earlier emerges in the background, and the pair prevents indiscriminate murder at the Tokyo Big City Marathon event by suppressing the perpetrator. The two arrest the true culprit, who has committed the crimes in order to expose the "S File", which was buried by the government. Subsequently, the file is published by Katayama.