Crown Princess Leontina, who repeatedly spends her money out of loneliness, is blamed for her crime and is executed. If I had my life to live over again... I would not fail this time. The next moment she realizes that she's going to die, she wakes up on the morning of her eighth birthday...? I know the future, and I can rule this country better than anyone else...! In order to escape from the future where she will be executed, Leontina decides to fight for the throne herself. The worst queen's life is about to be turned upside down...!