The first part tells about the life of the main character - Kagero. She is the Master of the Sword and rules the principalities that she inherited from her parents and her deceased husband, and tries to find those responsible for her husband’s death in order to take revenge. She does not yet know that the killer is her uncle, who, by right of the eldest relative, is now forcing Kagero to marry Prince Ookami. His goal is to increase his niece's fortune and later, by killing her, gain control of money and lands. Having found out the truth, Kagero decides to challenge his uncle, but he finds out about his niece’s intentions, steals Kagero’s daughter and takes him to another continent.