Yumiko Sato was spirited away by yokai when she was seven-years-old. Kagami, the yokai lord of a magical realm that exists beyond mirrors, allowed her to leave, but vowed that he would come for her when she turned eighteen, whereupon he would consume her, body and soul. When she returned from that strange world, Yumiko found that everything had changed. She could see the supernatural monsters of Japan called yokai, when no one else could. She could return to that terrible place by walking through mirrors. And her mother had disappeared. With less than a year left before Kagami comes for her,...