After being reincarnated into a novel as a four-year-old girl, Diane discovers that she has become the daughter of a notorious villainous duke. Knowing that her entire family is destined to be destroyed by the protagonist, she tries to run away to avoid their tragic fate. When her escape attempts fail, she decides to reform her villainous family instead. However, her plan works a little too well, turning her cold-hearted father and troublesome older brothers into an overly protective, doting family obsessed with her.