The series is based on the eponymous Japanese thriller. The story revolves around a law enforcement officer consumed by a thirst for revenge. He is searching for the people responsible for the terrorist attack in Tokyo. Throughout the capital of Japan, sirens wail, and debris and dust settle on bloodstained concrete. All television channels and media outlets are filled with discussions of the devastating terrorist attack, which resulted in a large number of casualties. Kuraki, a determined and formidable officer from the Public Security Bureau, begins his investigation.