You are the first female Emperor to lead the Cryzens empire. But it turns out that political members thought you were weak so they targeted you for murder using a serial killer. Murders are now common in the empire. That's why your sister came to see you to talk. "You have to find a companion to save your life, Sis. At least a contract companion." She's your little sister, even though she's a troublemaker, she makes your life comedic. She is loyal to you. (Depending on what you do, the story of the empire will progress.)