Moka and Karina are twins appointed as Royal Saintesses for their ability to use rare healing magic. However, the older sister, Karina, suddenly abandons her duties, leaving Moka to shoulder all the responsibility and spend her days overworked. One day, after having her achievements stolen by Karina, Moka is told she is no longer needed as her "sister's spare" and is forced to marry Count Alexis Veliky, the commander of a cursed knight order. However, Moka is thrilled at the start of a new life, thinking, "I'm finally free from such painful work!" and heads to the Count's territory in high spirits. What awaits her in that frontier land of endless bad rumors is Alexis—a husband with secrets who views Saintesses as enemies—and the members of the cursed knight order...? A romantic fantasy about a Saintess, once looked down upon as a spare, who unleashes her true power, heals the cursed knights, and becomes beloved and needed!