"I've decided. I'm going to marry you." Yuno, the daughter of a family destined to become the bride of a demon god living in the human world. Having been forced into a servant life due to her unfortunate circumstances, Yuno had lived a life far removed from demon gods, but she meets Hibiki, a demon god, and is taken into his mansion at his sole discretion. As she lives with the inhabitants of the mansion, and with Hibiki, the "demon god" who had no interest in love, Yuno's life begins to change dramatically...