In this world, humans and ayakashi spirits live in harmony. The ayakashi, endowed with power and beauty, sometimes choose human wives for themselves — their ‘brides’. In exchange for their well-being, these women receive the ayakashi’s undying love. Yuzu is constantly compared to her sister, who became the bride of a fox demon, and this torments her. But one day, a stranger appears before her on a bridge—the most beautiful man she has ever seen. And he calls her his wife?!