The number of gun-carrying groups has increased dramatically, and Japan's public security has deteriorated significantly. The crisis of becoming a gun-prone society is imminent. The Metropolitan Police Department, which is unable to cope with the situation with the police system, has established the "Special Armed Unit (SGU)" composed of police officers and civil organizations. Under extralegal measures, a small group of elite experts use guns, special vehicles and the latest technology to fight against the thugs.