After his grandfather's death, Takeru visits his rural estate, but he was not expecting to be suddenly kissed by a beautiful fox spirit. Kazune is a spirit that had a special bond with Takeru's grandfather and had been looking forward to his return. As the only other member of his family with the ability to see supernatural beings called yokai, Takeru feels responsible for taking care of Kazune and brings him into his home. However, the yokai's need to consume human life energy and the shocking promise that his grandfather made to Kazune leave Takeru with questions about what shape their relationship will take.