After the September 11, 2001 attacks on American soil, the Tokyo Metropolitan Police Department creates a secret anti-terrorist division within the Public Security Bureau in order to tackles crime, espionage and terrorism cases to preserve Japan's national security by doing black ops work to locate and apprehend spies and terrorist suspects.
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The TV show follow a female police officer who was recruited into the Tokyo Metropolitan Police's anti-terrorist black ops unit known "publicly" as the Fourth Foreign Affairs Section, created after the 9/11 events in the United States.