The story, which is set in the "Special Investigation Countermeasures Room" of the Metropolitan Police Department, which was actually established in Japan in November 2009, unfolds through the eyes of Sakuragi Izumi (played by Ueto Aya), a new member of the team. Sakuragi Izumi, who works in the Special Investigation Countermeasures Room, is a passionate and persistent young man. With a strong sense of justice, she cannot let unfairness and unresolved things happen. The Countermeasures Room is a place where all kinds of elites gather. Izumi's direct superior, Nagashima Hideo (played by Kitaoji Kinya), is one of the famous figures in the Metropolitan Police Department. In addition to the excellent team, the Countermeasures Room also has the most advanced technical equipment, such as using DNA to identify the murderer. Such a Countermeasures Room focuses on those unresolved incidents and concentrates on investigating difficult incidents, just to seek the truth and give justice to the victims. This is the goal of the Countermeasures Room. A tense and exciting story unfolds...