Ouri Kagami lives at a shrine alongside other orphans, so he is accustomed to seeing corpses. However, he is deeply shocked when he witnesses Keisei Tagami, the patron of his orphanage, apparently bring the scarred body of schoolgirl Makina Hoshimura back to life. Fascinated by the mysterious circumstances surrounding Makina, he discovers that she is a Shikabane Hime—an undead entity assigned to eliminate others of her kind who threaten society. As Ouri continues his daily routine, his inexplicable encounters with her are marked by abnormality. Yet, as each meeting becomes more intense, the two draw closer together, and their intertwined fates may hold the key to revealing the secrets of the Shikabane world.