Zen Seizaki, a public prosecutor at the Tokyo District Public Prosecutors Office, is investigating a case of illegal clinical research involving a pharmaceutical company and a university. During the investigation, he discovers a file kept by Shin Inaba, an anesthesiologist, which contains blood mixed with hair, skin, and a paper marked with the letter F. As he probes further, he realizes there is a hidden plot connected to a major election and a specific person in charge of it. (Source: ANN)