This is a love story that begins with an engagement. Miyo Saimori was born into a family of supernatural powers, but she did not inherit any abilities. She was treated like a servant by her stepmother and half sister. However, she should have been married long ago, but the person she was engaged to was the legendary cold-blooded head of the Kudo family, Kudo Seika, who also had supernatural powers. Is this marriage an invitation to the underworld? Or a miraculous encounter?