In this world, there exists a "Saintess" who is tasked with protecting the country from monsters. Filia, born into a family in the Ziltonia Kingdom that has produced Saintesses for generations, has acquired such remarkable skill through rigorous training that she is praised as "the greatest of all time," and she works diligently at her duties every day.
However, due to her perfection, she becomes disliked by those around her, who find her "too perfect to be charming." Her fiancé, the second prince Julius, even breaks off their engagement.
Moreover, she is sold to the neighboring kingdom of Palnakorta, which is suffering from the absence of a Saintess, in exchange for money and resources, forcing her to leave her homeland.
Filia, preparing herself for a life of miserable treatment in the neighboring country, is instead met with an unexpected warm welcome...!?