Kohakushoku no Kishi wa Seijo no Hidarite ni ai wo Chikau

A black knight named Quill is unexpectedly asked to marry Linetta Series, the country's saint. To avoid the marriage, he agrees to an unsuitable proposal, unaware that she has lost all emotions as part of her role. Linetta's expressionless, doll-like demeanor makes it difficult for Quill to understand her, yet spending time with her begins to affect him. As a knight who has lost his faith encounters a saint who has lost her feelings, their fates slowly start to shift.