After a long war between humans and vampires, it finally subsided, and the two societies maintained a state of peace as they were independent and communicated with each other.
As a police officer, Kuroko Tetsuya came to Fein Town after taking over the case of a missing teenager.
With no progress, they planned to visit a very famous philanthropist in the town of Fein, who was also a vampire, Slinsayer Rizeli. However, when he arrived at the door of the vampire's house, he was told by the policeman standing outside that he had committed suicide...