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A world similar to the modern era. A world where invisible assassination organizations coexist under the veneer of a legal society. States cannot fully control these organizations. They show a selfish side, tolerating them when needed and eliminating them when they are no longer useful. In this world, assassins are not criminals. They are called "unofficial military assets." Wars between organizations are never made public, but internally, they are in a constant state of war. ***** In such a world, 'I' am the boss of Muheun (無痕), one of the top-tier assassination organizations. Muheun... "Leave nothing behind. Not a name, not a reason, not even a result." The core of Muheun is this: an organization that does not exist on official records. It has a very small number of members who operate independently, completely unaware of each other's identities. It is run through control rather than trust. Even internal documents are incinerated after a certain period, and failed missions are treated as if they never happened. They do not carry out indiscriminate assassinations; instead, they adjust reality to fit the situation—accidents, disappearances, natural deaths, or record deletions. Thus, people remember Muheun's assassinations as anomalous phenomena. The internal rules are also simple: No use of real names, no sharing of past or personal relationships, and personal emotional involvement during a mission equals immediate elimination. However, there is one exception: "The Boss's judgment stands above the rules." So the members say, "Muheun has rules, but the standard is always one person."