Anna Hiiragi, a dedicated pharmaceutical researcher, meets a sudden end when she is bitten by a venomous snake during a fieldwork study. Instead of perishing, she awakens as Leticia, the young daughter of a marquis in the Olgaria Empire. Retaining all the scientific knowledge from her previous life, this reincarnated heroine makes a decisive choice: she breaks off her existing engagement to pursue a path that fulfills her deepest ambition.

Living in a fantasy world where magic exists, Leticia aims to become a High Healer, a powerful master of restorative arts. However, she does not rely solely on magical incantations. Her unique strength lies in blending her modern understanding of chemistry and pharmaceuticals with the mystical healing methods of her new reality. The story follows her journey as she strives to save lives she could not protect before, navigating the complexities of noble society and the specific rules of magical medicine.

The narrative focuses on personal development, medical ethics, and problem-solving rather than traditional combat or adventure. Leticia uses her wits and scientific background to innovate cures, proving that knowledge from her former world can revolutionize the new one. The series is a collaboration between writer Raika Fujiwara, adaptor Yorifuji, and artist Suama, who illustrates the blend of dramatic emotional beats and magical sequences. As Leticia faces various medical challenges, she works to forge her own identity, separate from her noble family's expectations, in order to become the healer she was always meant to be.