In the magic kingdom of Elmia, where magical aptitude determines social standing, a young noble girl named Mitia Lumiol carries the memories of her past life. In her previous existence, she found solace only in stories of cunning and powerful villainesses, and she resolves to become an elegant and fearsome villainess in her new life—someone who can live freely and on her own terms. However, Mitia possesses only the lowest grade of household magic, a severe handicap in a society that worships high-powered spells. At the age of ten, the noble council deems her worthless and banishes her to a dangerous, run-down frontier territory, expecting her to fail or die.

Far from being a punishment, Mitia sees the wild frontier as the perfect stage for her villainous ambitions. Free from the constraints of the capital, she begins to reshape the land using creative applications of her so-called useless magic. She improves agriculture, cures a rampant infection, and revitalizes the local economy—all while believing she is acting like a dashing villainess. Her efforts, meant to be selfish power plays, are misread by the grateful locals as benevolence, and her popularity soars.

Mitia gains two fiercely loyal retainers: Vincent, a butler with a secret past as a top-tier agent, and Ciel, a maid whose devotions leads her to master espionage skills. Together, they support Mitia’s increasingly ambitious schemes. Her success draws the attention of the kingdom’s hidden rulers, the Three Hundred Committee, and the corrupt nobility who see her rise as a threat. When the nobility convenes an inquiry to undermine her, and an assassination attempt is made, Mitia’s path to becoming the ultimate villainess intensifies. She must outmaneuver political traps, uncover dark conspiracies, and continue her crusade against injustice—all while maintaining her image of a cool, elegant villainess. A key turning point occurs when she tries to reject a prince’s proposal as part of her villainous plan, only to have him accept, complicating her vision of a solitary free life. Through every conflict, Mitia proves that true evil, in her charmingly twisted definition, is what a corrupt world needs.