Takizawa Hayato, whose parents are both human but has been a vampire since he can remember, lives a life of killing vampires because he hates vampires - he has no purpose and does not know what he is living for. One day, the duo who stopped him on the road claimed to be a demon (Noel) and a vampire (Ray) from the demon world. They came to the human world for spiritual practice. They need his help because they are underage, and they will protect him so that he no longer needs to deal with the vampires.
The ambiguous relationship between Lei and Takizawa eventually turned into unsatisfied lovers. Noel, who liked Lei, was unrequitedly in love with Hades, but Takizawa secretly cared about Hades' every move. The heart-wrenching polyamory is floating in the torrent of history. Who belongs to whom in the end?