Vampire hunter D is the descendant of the vampire king and human woman, he is agile, is a famous vampire hunter. This time, Charlotte, the daughter of the Elbon family, was taken captive by vampires, and the landlord invited D and the vampire hunter Marx to the rescue. On the way, D and Marx's brother and sister competed with each other for remuneration, which broke up in discord. Subsequently, D was attacked by the three heroes of the aristocracy, and D suddenly fell ill at a critical moment. Leila, one of Marx's siblings, saved D. they agreed that whoever died first would go to his grave to lay flowers. Later, they found out that Charlotte was not taken by vampires, but fell in love with the vampire Mael, and the two eloped together. They are on their way to Camilla's castle to take Camilla's spaceship to Xanadu "Night Capital" to start their new life. However, Camilla only tricked them away, and her real purpose was to suck Charlotte's blood and bring herself back to life. D arrived in time and started a life-and-death battle with Camilla.