A board game company president suddenly finds himself transported to a monster-infested land with no humans in sight. He is given no cheat abilities or magical powers. His only weapons are the management knowledge and business experience he cultivated in his previous life.

The protagonist, Naruse Koshi, must rely entirely on his corporate skills to survive and find a way back to his original world. He is thrust into the lowest rung of the Demon Lord’s Army, which has been strangely organized like a company. His goal is to climb the corporate ladder of this monstrous organization and eventually become the Demon Lord himself to defeat the hero.

The story focuses on Koshi’s struggle to earn the trust of his monstrous colleagues, who initially look down on him as a weak and inferior human. Without any combat skills, he uses business strategies such as labor negotiations, workflow optimization, and personnel management to overcome unreasonable quotas and solve department-wide crises. His approach begins to change the workplace culture and earns him promotions from slave to team leader and beyond.

Notable narrative arcs include Koshi being assigned an impossible sales target by a power-harassing section chief, which he cleverly uses as an opportunity to secure resources and authority. Another arc sees him seconded to a different department on the front lines of a war against humanity, forcing him to navigate the brutal realities of combat using logistics and tactics. A later arc involves Koshi being transferred to a department led by a hot-tempered female superior, where his entire team faces intense power harassment. As Koshi rises in rank, he eventually contends with the violent political struggles and conspiracies among the Demon Lord’s executives over the throne itself.

The setting is a fantasy realm where the Demon Lord’s military functions like a modern corporation, complete with departments, quotas, and human resources issues. The main character is Naruse Koshi, a former president who is pragmatic, resourceful, and resilient. The supporting cast consists of various monsters, including a groveling and self-serving section chief, loyal colleagues who benefit from Koshi’s leadership, and antagonistic superiors who embody toxic management styles.