A nameless man reincarnates as Vanitas Lindblum, the ruthless young marquis who serves as the villainous aristocrat within a fantasy story. Aware that his new role is destined for a bad ending, typically dying at the hands of the story's hero after having his heroines stolen away, he decides to defy this predetermined fate. Using his knowledge of the world's narrative and its forgotten ancient magics, he wields the absolute power of Domination Magic to fight against his coming destruction. Rather than waiting to lose the heroines, he instead attracts them to his side, forming a harem of former slave girls who become captivated by his actions. The story follows Vanitas as he resists the ruin that awaits him, aiming to rise to the top of the magical world while walking his own path of ruthless ambition.

The central character is Vanitas Lindblum, a villain who embraces his cruel nature to protect what he values and to pursue power. He is surrounded by the heroines originally meant to be taken from him, who now serve as his allies and love interests. A key figure introduced later is Razeria Ruandore, known as the Violent Dragon Princess, an imperial princess who suddenly proposes marriage to Vanitas, creating new complications and challenges. The story is set in a magic-based fantasy world of aristocrats, slaves, and ancient magical systems that the reincarnated protagonist exploits for his survival.

Notable narrative arcs include Vanitas cutting off the flow of the original story upon meeting the hero Angel, acquiring the former heroine Habell Messiah as a slave, and later confronting the imperial princess Razeria who tests him as a potential husband. The overarching conflict pits Vanitas against the future destruction he knows is coming, using his Domination Magic and gathered heroines to carve his own path to supremacy rather than submit to the narrative's intended ending.