After being betrayed and killed by the very emperor she helped put on the throne, a powerful chancellor makes a contract with mysterious monsters and returns ten years into the past. Her mission is simple: put an ordinary young girl on the throne of the Karia Empire. However, there's one catch: if the girl dies, she is sent back in time again. Her ambitious plans quickly fall apart when she discovers that her chosen candidate is unbelievably fragile, seemingly dying at the slightest misfortune. With only a limited number of chances, she must do everything possible to make the girl empress and secure her own survival. But as knights become involved, her mission unexpectedly turns into a complicated battle for love...