Taking place in the future era of human beings and various creatures written by Mr. Kikuchi Hideyuki, the lone ranger-like vampire hunter D has half-vampire blood. By chance, he met a mysterious and beautiful young man whom he later called "Yao". Ever since Yao entrusted him with retrieving a human girl from a vampire, an invisible bond has formed between them. One thing after another, he was hired by Yao again, with the goal of killing the king of the demons, whether he was the current one or his successor. The adventurous journey begins. Because of blood and desire, the vampire hunter who has no future and Yao who has no possibility of luxurious love are attracted to each other. The journey is sad at the beginning. The end of the journey is the end of life.