This is a dark, chilling tale about a young girl named Miyu, upon whom the inherent duty of Guardian was thrust by the rulers of the Dark. A time came when the Earth and the Dark were joined by a rift. At that point, the Shinma, entities of godly and demonic qualities, were returned to their rightful world. However, some were left behind on the earthly plane. More still are able to escape by the will of disturbed minds invoking necronomic powers. Oftimes, these beings prey upon the humans for their blood, their dreams, their emotions, and their souls. Miyu's task, therefore, is to send the Shinma back to their shadowed dwelling. To help her in her quest, Miyu is granted immortality among other traits, but at a cost. Miyu and her kind are still vulnerable to the weatherings of time. To sustain her existence, she herself must feed upon the humans, giving them everlasting life in exchange for their blood and their souls.

Episode I: Ayakashi No Miyako

Himiko, a spiritualist, travels to Kyoto, Japan's ancient capital. There she attempts to exorcise a young girl named Aiko, who is later found to be possessed by Raen, the Shinma who feeds on people's dreams. Her investigation leads to a case of serial female murders, wherein the victims' bodies are completely drained of blood. Though determined to find and eliminate the cause of the girl's illness, Himiko is unsuccessful in her efforts. That is, until she meets Miyu and Larva. She also runs into Miyahito, the boyfriend of the first victim, on whom Miyu happens to be keeping an eye. Himiko is advised by Miyu to no longer pursue the matter at hand. This, however, only convinces Himiko of her own suspicions that Miyu is behind the vampiric attacks.

Episode II: Ayatsuri No Utage

Spiritualist Himiko is hired by a man to investigate his daughter's strange disappearance at school. A student hands Himiko a sketch of an intriguing manequin-like doll found where she last saw the girl. Once again, Himiko encounters Miyu, who now apparently goes to that same school. Himiko's suspicions are reinforced when Miyu sets her sights on a popular boy named Kei. Yet Miyu is not alone in her hunt, for another unearthly being has an interest in the boy's soul. Miyu later attempts to banish Ranka, a formidable Shinma, as they battle over Kei's body and spirit. However, Miyu is too late to keep Kei away from Ranka's intentions. Himiko then discovers a different side to Miyu, one apart from the being whose relentless thirst for blood haunts Japan.

Episode III: Moroki Yoroi

Himiko is fully determined to hunt down the Vampire Princess. Her pursuit is fuelled not only by the search for justice and peace, but also by the need to satisfy her own longing for the truth. Himiko's endeavors are rewarded when Miyu comes to her and asks for her help. A man's soul has possessed an ancient suit of samurai armor. The entity has been charmed by the magic of Lemures, a Shinma who gains the power to reincarnate and manipulate souls if offered a sacrifice. The dead man's spirit now believes itself to be a true Shinma, and it plunders the local townsarea under the orders of Lemures. Miyu needs Himiko to exorcise the armor and release the troubled soul. In return for her aid in battle, Miyu tells Himiko about herself and how she met Larva.

Episode IV: Kogoeru Toki

Himiko's travels lead to the town of Kamakura, the capital of the Kanto area, where she spent most of her childhood. In reminiscing her past, Himiko dreams of herself as a little girl. She is haunted by vague memories of wandering off to, then running in terror from a mysterious mansion. On a whim, Himiko decides to revisit the great old house, where she meets its new occupant, Miyu. Therein, Miyu at last tells the story of how she discovered her true nature after her initial encounter with Larva. Miyu also reveals the secrets of her family's heritage, and relays the events that occurred the night the Shinma gathered together in the Dark. Himiko then finally realizes that her destiny is forever bound with Miyu's by the secret of their blood.