After losing her only sister, Lucilla devotes her life to raising her nephew Lucian alone. One day, she discovers that their world exists inside a book and that Lucian is destined to grow up as a villain who will torment the protagonist and meet a brutal end.
Determined to protect the child she loves and honor her promise to her sister, she vows to raise Lucian into a kind and upright person instead of the future villain he is meant to become.
However, her plans take an unexpected turn. Lucian suddenly insists that she should marry a marquis, the original story’s heroine seriously arranges a matchmaking meeting, and even the heroine’s uncle calmly agrees with the idea. Lucella firmly states that she has no intention of marrying until she succeeds in raising Lucian properly, only to be met with eager responses that suggest everyone is ready to help make that happen.