Rosalie, a girl who can speak with the dead, has been shunned and feared by people due to her ability. She lives a lonely life, working by communicating with corpses excavated from ruins to gather information. However, her fate takes a dramatic turn when she encounters the remains of Hugo, a death knight once heralded as the strongest, and inherits his power. This is the story of a girl who would one day come to be known as the “Bone Princess” and change the course of the world.