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Public Security Unit: Zero — Organizational Setting 1. Organizational Overview In this world, the national security apparatus is divided into two main entities: **Public Security, and a top-secret unit positioned even higher, known as "Zero."** Public Security Public Security is the operational organization responsible for maintaining domestic order and handling incidents related to national security. They investigate and monitor matters that could threaten national safety, such as terrorism, extremism, espionage, and major organized crime. Public Security is a large-scale organization with many investigators. Therefore, it basically operates under a clear chain of command and regulations, similar to a standard police organization. Meanwhile, **"Zero"** exists above Public Security. ⸻ 2. Zero **Zero** is a top-secret department specializing in national-level cases that even Public Security cannot handle. Extremely few people know of its formal existence, and even within Public Security, the majority are unaware of the department's existence. There are approximately 200 members across three ranks. Zero does not handle simple cases. They deal with matters where multiple Public Security cases lead to one massive organization, cases that influence the government or police internally, or cases involving national secrets—incidents where the act of processing them through normal Public Security channels is itself dangerous. Minimum necessary lethal force is authorized. ⸻ 3. Ranks of Zero Zero has its own unique three-tier ranking system, distinct from general Public Security organizations. First Rank: Investigator The operational personnel of Zero. They are responsible for field investigations, intelligence gathering, and surveillance of targets for cases handed over from Public Security. Zero Investigators have higher information access rights than normal Public Security investigators and can directly view a portion of the information held by Public Security. However, they do not have the authority to move the entire Zero organization on their own. Role: Operational Personnel ⸻ 4. Second Rank: Inspector They command Zero Investigators and manage national-level cases as a whole. They have the authority to inspect Public Security's investigation status and decide whether to transfer cases handled by Public Security to Zero. Furthermore, if deemed necessary, they can demand changes in investigation policies or the submission of information from Public Security. Role: Command and Inspection ⸻ 5. Third Rank: Superintendent The highest rank in Zero. They make final decisions on national-level cases and command Zero as a whole. They are permitted to give direct instructions to Public Security and can temporarily operate beyond the normal Public Security chain of command. However, this authority is not unlimited and is restricted to grave matters concerning the survival of the nation. The movement of a Zero Superintendent itself signifies that "a situation has occurred that normal Public Security cannot handle." Role: Chief Executive of Zero ・Basic Combat Capabilities of Zero Zero investigators undergo combat training that exceeds that of Public Security elites. * Physical Ability: Greatly exceeds that of ordinary people, capable of long-duration combat and pursuit. * Combat Ability: Excellent in hand-to-hand and close-quarters combat, capable of handling multiple opponents. Everyone is trained to handle handguns and daggers. * Judgment: Analyzes situations instantly even during combat, neutralizing threats with minimal movement. The gap between ranks is significant; higher-ranking investigators are far superior to their subordinates. Calmness, rapid mental processing, and the ability to communicate concisely are also essential. The hierarchy within Zero is very strictly maintained.