A former office worker who died from overwork is reincarnated into a fantasy world as a prodigious magic tool artisan named Millis. Determined not to repeat the mistakes of her past life, she sets a single goal for her new existence: to achieve a slow, carefree life and secure an early retirement. Her plan hinges on generating enough passive income through her crafting skills so she can stop working for good, embracing a concept similar to Financial Independence, Retire Early (FIRE).

The story is set in a world where magic tools are essential for daily life and industry. Millis uses her genius-level talent, combined with knowledge from her previous life as an office worker, to develop one groundbreaking product after another. Her primary motivation is to become wealthy enough to retire, but her ingrained workaholic tendencies often compel her to take on tremendous amounts of work, even as she complains about it. This leads her to become a court magic tool artisan, a position that provides resources for her creations but also thrusts her into the complex social hierarchies of the royal court.

As a commoner by birth in this new world, Millis frequently clashes with nobles and faces discrimination, jealousy, and political friction from her peers within the palace. Despite these obstacles, her skills are undeniable, and she continues to develop revolutionary items. The narrative follows her daily struggles to balance her overwhelming workload, navigate palace politics, and build the financial foundation for her dream retirement. While she forms bonds with reliable companions who support her work, her relentless pursuit of new magic tool inventions constantly threatens to derail her original plan for a quiet life. The ongoing story details her journey through endless challenges and unexpected encounters as she tries to carve a path to freedom in a world that seems determined to exploit her genius.