About

On the surface, it is a normal modern society. However, there exists an assassination industry that even governments, corporations, and giant organizations cannot easily touch. In their world, incidents are resolved through killer organizations and brokers rather than the police or military. **1. The Killer Industry** Not just anyone can become a killer. The industry maintains official ranks based on skill and mission history. F → E → D → C → B → A → S → U → X Average killers stay at C~B rank, while names start becoming known from A-rank. X-rankers are monsters counted on one hand globally. Among them, there is a rank only one person can hold: **NO.0.** NO.0 — The Industry's Peak NO.0 does not simply mean a strong killer; it means **"a human for whom the possibility of mission failure does not exist."** **2. NULL** Among many killer organizations, this one sits at the very top. Neither headquarters nor nations can treat them lightly. It is an organization that earns hundreds of millions monthly, and in good times, trillions. Most members of NULL are top-tier killers who have made a name for themselves in the industry. Inside the organization, codenames are used instead of real names. Examples: NULL-01 「RAVEN」 NULL-07 「WHITE」 NULL-13 「MOTH」 NULL-21 「DOG」 NULL-00 「VANTA」 Particularly, NULL-00 is on a completely different level from the other members. **3. Requests** Requests for killers exist in various forms beyond simple assassination. Eliminating specific targets Protecting high-value assets Information recovery Tracking traitors Resolving internal organizational issues Subduing key figures of rival organizations Tracking missing persons Monitoring dangerous individuals However, the requests NULL handles are on a different dimension. They receive requests capable of shaking the fate of a nation or a mega-corporation. **4. Relationships Between Killers** Killers are fundamentally competitors. However, as they rise to the top, they sometimes view each other as rivals and colleagues. X-rank killers, in particular, are so few that they usually know each other's names. **5. Training Grounds** Some large organizations scout talented individuals from childhood to train them in secret. However, NULL's training is a hell that surpasses human endurance. The larger the organization, the higher the level of training. They recruit only those who survive that training. **6. Police and State Agencies** ⚖️ State Agency — 「CIPHER」 A transnational special agency jointly created by governments to manage and track killers and assassination organizations. They handle high-risk criminals, assassination groups, and national-level threats that regular police cannot process. Their existence is almost unknown to ordinary citizens, and only a tiny fraction within the police force knows of them. Regular Police National Police Agency Handles general crimes. Murder Disappearances Robbery Terrorism Illegal weapons cases, etc. When a killer-related incident occurs, the police control the scene first, but the moment a killer's identity or organization is confirmed, the case is handed over to CIPHER. CIPHER An officially recognized special agency of the state. Main missions include: Tracking killer organizations Arresting high-risk killers Tracking funding and information networks of killer organizations Protecting key national figures Cases involving S-rank or higher killers almost always fall under CIPHER's jurisdiction. CIPHER Ranks D-CLASS General field agents. They investigate traces of killers and control scenes. C-CLASS Official agents capable of both combat and investigation. Level enough to face C~B rank killers. B-CLASS Special operations agents. Responsible for arresting high-risk killers or wiping out organizations. A-CLASS Core power of CIPHER. Agents who can fight somewhat equally even with S-rank killers. EXECUTIVE Top-tier CIPHER agents. Only a few exist worldwide. They are treated as the state's secret weapons, capable of directly confronting S~U rank killers. CIPHER Special Departments -> 🔎 TRACE Investigation and tracking department. Analyzes killer identities, movement paths, and organizational ties. Low combat power but top-tier in information warfare. 🛡️ GUARD Specialized protection department. Protects individuals at high risk of assassination, such as presidents or corporate heads. Upper agents possess combat power incomparable to general bodyguards. ⚔️ VANGUARD Combat specialized department. Handles raids on killer hideouts, wiping out criminal organizations, and arresting high-risk suspects. The force-oriented department. 🕶️ WRAITH Infiltration and intelligence department. Plants agents inside killer organizations or extracts information. Some agents even go undercover as actual killers in the industry. ☠️ NULL RESPONSE The final response department. Moves only when NO.0, X-rank killers, or national-level threats occur. The personnel list itself is top secret. CIPHER and killer organizations are in a hostile relationship, though they occasionally cooperate depending on the situation.