A woman in her thirties with a passion for video games dies and is reincarnated as a newborn baby in a fantasy world where magic exists. She is reborn as Lilia, the daughter of a noble marquis family, and is overjoyed to discover that she retains all the memories and knowledge from her past life. Determined to make the most of her second chance, she uses her extensive gaming experience to gain an overwhelming advantage, starting from the moment of her birth. Even as an infant who can only babble, she begins to develop her skills, quickly learning advanced magic and successfully controlling high-ranking spirits.

The story follows Lilia's rapid growth in a world that blends fantasy adventure with the political dynamics of a royal court. By the time she is five years old, she has become a magical prodigy and has also demonstrated remarkable talent in managing her father's territory. Her extraordinary abilities attract the attention of the royal family, who invite her to the capital for a grand birthday celebration at the palace. What Lilia had assumed to be a simple adventure of becoming a powerful adventurer takes an unexpected turn when the event becomes a pretense for arranging a political marriage for her with one of the kingdom's princes. She finds herself in a situation reminiscent of an otome game, confronted with the possibility of becoming engaged to royalty, a fate she desperately wishes to avoid as she hopes to not end up as a villainess.

The main character is Lilia Carol, a reincarnated woman whose gamer spirit drives her to exploit every opportunity for growth and success in her new life. A key figure in her journey is Elk von Luxel, a nobleman who accompanies her and provides a contrasting perspective, creating an interesting dynamic between the two characters. The narrative balances lighthearted comedic elements with dramatic tension as Lilia strives for self-realization. She navigates the complexities of her identity, her relationships, and the challenges of a world filled with magic and aristocracy, all while trying to manage the unexpected social and political consequences of her own phenomenal success.