A young Japanese woman dies and is reborn in a fantasy kingdom as Luxeria von Ascarid, the princess of the realm. Possessing immense magical power that frightens even her own family, she agrees to live in isolation inside a remote tower, intending to enjoy a quiet, peaceful second life. However, that peace is shattered when her royal parents are betrayed and assassinated by the five marquis houses that control the kingdom’s politics. Forced to return to the capital, Luxeria is placed on the throne as a figurehead—a beautiful “doll princess” whom the nobles believe they can manipulate.

Behind her placid mask, Luxeria burns with a desire for vengeance. She conceals her true magical might and plays the part of a naive, powerless puppet ruler while secretly gathering allies and using her knowledge from her past life to expose corruption. Her fiancé, Crown Prince Wilhelm, is caught in the political crossfire; to protect him and further her plans, Luxeria stages his death during her coronation, pretending to have killed him herself. This act solidifies her reputation as a ruthless queen and allows her to move against the five houses without interference.

The story follows Luxeria’s calculated campaign of revenge. She systematically dismantles the marquis families, rooting out their crimes—including a child-trafficking operation involving magical children—and purging them in a blood-soaked purge. Her actions draw the attention of the neighboring kingdom of Seldin, which had secretly manipulated the marquis from behind the scenes. War erupts, and Luxeria leads her forces to the border. Yet her relentless use of her own life force to power her magic has taken a severe toll; her body is weakening, and her death is approaching. In the final battle, she collapses on the verge of dying. Her lady-in-waiting, Alicia—whom Luxeria had once resurrected with a legendary sword—uses the lingering power of that sword to save her, and Wilhelm, awakened from his feigned death, returns to her side. Luxeria survives, stabilizes the kingdom, and three years later is recognized as the terrible but effective queen who rebuilt the realm from the ashes of betrayal.

The primary characters include Luxeria, the reincarnated protagonist who is both a cold schemer and a woman capable of deep loyalty; Alicia, her devoted attendant who becomes the key to her survival; and Wilhelm, the prince who willingly sacrifices his public existence to aid Luxeria’s revenge. The setting is a standard European-style fantasy kingdom with magic, noble houses, and a neighboring hostile state. The narrative arcs cover Luxeria’s isolation, the murder of her parents, her coronation and the staged death of Wilhelm, the purge of the five houses, the revelation of the child-trafficking conspiracy, the war with Seldin, and the final reckoning with the cost of her power. The tone is dark and dramatic, blending political intrigue, revenge, and romance with a focus on a protagonist who remakes herself into a feared queen to achieve her goals.