Twin sisters Mocha and Karina, appointed as royal saints for their rare healing magic, find themselves constantly working after Karina suddenly abandons her duties, leaving Mocha to shoulder both her responsibilities. One day, Karina steals Mocha's

credit and declares that she's no longer needed as a "sister's spare," forcing her to marry Alexis Veliki, the commander of the cursed knight order. However, Mocha is thrilled at the prospect of a new life, thinking, "I'll be free from this arduous job!" and sets off for the frontier territory in high spirits. But what

awaits Mocha in this remote land rife with bad rumors is her ill-fated husband, Alexis, who harbors a grudge against saints, and the members of the cursed knight order—…?

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