The day 18-year-old Laliette Isabelle De Bellua died is forever etched in her mind. Her entire family already six feet under on false charges of treason, she is sent to the gallows with her sentence being handed down by the tyrannical Emperor Rupert Edgar Laspe Vellelum. In contrast to his ethereal beauty, he has bathed himself in blood; not even his wife was free from the carnage, falling victim to his hand on their wedding night.

After meeting her end, Laliette awakens in the past on her 12th birthday. Despite having knowledge of the grim future, the only way she can think of to save her beloved family is to endear herself to the bloodthirsty Rupert before his rise to power. There is only one problem: Rupert is currently living as a woman—the oft-forgotten "Princess Rapertte," whom no one wants to serve. With little in her pocket, Laliette runs away from home to pledge herself to Rapertte, hoping to one day earn the princess's trust and save the people she treasures.