You Cast Me Aside Like a Saintess, Now You Want Me Back.

Spica, a saint who has served her country for years, is cast aside when advances in potion-making make her powers seem unnecessary. Her engagement is annulled, and she is ordered into exile. Determined to try making potions herself, Spica accidentally creates a secret elixir infused with her saintly magic. After rescuing a neighboring nation's prince, she catches his attention and begins a new life as a court pharmacist. As her cheerful work produces potions that help people, she gradually regains her confidence—while her former fiancé tries to reclaim her after learning about the elixir.