When an ordinary female high school student carrying the ancient "Heart of Morning" pendant meets a thousand-year-old vampire who has been exiled in the "Corridor of Eternal Night", a taboo contract spanning light and darkness, life and death, and time and space is concluded. In the crisis-ridden modern city and the supernatural world, the two work together to uncover the mystery of their life experience, fight against ancient conspiracies, and explore a path of symbiosis that transcends racial boundaries.
Concept: Vampires and the fate of humans