Norito Ogami, an average student, has a tendency to attract demons. Koma appears before Norito, in accordance with the "Sigil Oath," a promise Norito made in his past life with Koma. The two are attracted to each other but Koma's siblings and his beautiful archenemy stands in their way...!? Yokai's Hunger is an eternal love story between a high school senior and a middle-aged beast brought together by fate!