In a version of modern Japan where humans and ayakashi, supernatural beings from folklore, coexist, a unique custom exists. Some ayakashi take human women as their brides, granting the women prosperity and social standing in exchange for their hand in marriage. Yuzu Shinonome lives in the shadow of her older sister, Karin, who became the bride of a powerful fox demon, bringing the family wealth and prestige. Yuzu is constantly compared to her sister and resented by her own family, who see her as worthless. Her life changes dramatically when she encounters a strikingly beautiful man on a bridge. He reveals himself as Reiya Kiryuuin, the heir to a powerful oni clan, and declares that she is the bride he has been searching for.

The series follows Yuzu as she is thrust into the hidden world of ayakashi society, leaving behind her neglectful family. Reiya is known as a cold-hearted and powerful ayakashi, yet he shows an intense and devoted affection for Yuzu, vowing to protect her. As she navigates her new life, Yuzu must learn to reconcile her feelings of low self-worth with her new position. The narrative explores her personal growth as she discovers her own strength while being courted by a supernatural being whose absolute love challenges everything she knows about herself. The story blends the classic Cinderella fairytale structure with Japanese folklore, centering on the developing romance between a human girl and the powerful ogre prince who chooses her as his own.