In a world shrouded by a mysterious mist known as "Fog", creatures called monsters roam freely. Those who fight them are known as "Job Holders" — warriors locked in a constant, grueling back‑and‑forth battle for survival. Then one day, the protagonist finds himself possessing the body of one of the weakest Job Holders in this world. As the memories of the body's original owner swirl chaotically through his mind, he stands frozen, unable to grasp what has happened to him. That is when a mysterious system message suddenly appears before his eyes: "Free Selection of Rewards." It seems that by defeating monsters, he can obtain absolutely anything — a full cheat system with no restrictions. Rather than overthinking it, he decides to accept his new reality and use this power to climb all the way to the top of this world.