Lucienne awakens in the body of a five-year-old villainess princess from an otome game. Despite being royalty, she is neglected, abused, and starved by the queens. Her life changes when she meets Lefèvre, a mysterious hidden character who is actually a deadly assassin. Rather than fearing him, Lucienne becomes attached to the first person who shows her genuine kindness. Their unusual bond gradually changes the fate that was supposed to await the villainous princess, leading to a dark, obsessive fantasy romance.