The story begins with the protagonist, a 35-year-old city dweller, finally saving enough money for a second life in the countryside. Tired of the overwhelming crowds and indifferent people of Tokyo, he dreams of a peaceful existence surrounded by nature, even purchasing a deserted village for a mere 100 yen. He prepares for a self-sufficient life, acquiring a hunting license and setting up power and heating systems. On his way to his new home, he stops at a convenience store. While waiting for the restroom, he witnesses a car accelerating towards him and, in a split-second decision, shoves a high school girl out of the way, sacrificing himself.
He then awakens as a baby, realizing he has been reincarnated into another world. His new mother, a beautiful woman with black hair and golden eyes, nurses him. He discovers he has a tail and ears, indicating he is not human. Examining himself, he confirms he is male and appears to resemble his father, a handsome man with sharp canine teeth, suggesting he is a vampire. His suspicions are confirmed when he tastes his own blood and finds it delicious, causing his fangs to grow.
As a vampire infant, he quickly adapts, learning to control his abilities. He discovers he can manipulate blood and, through rigorous training, develops resistance to sunlight, a significant challenge for vampires. His parents, Melchior and Laura Estrand, are powerful and unusual individuals. Melchior, a masked alchemist, and Laura, a formidable warrior, are implied to be ancient beings. Their household includes several beast-person maids, including Ridley, a clumsy but loyal fox-person, Martha, a strong wolf-person, and Celes, a quiet secretary.
Noel, as he is now named, is a prodigy. His exceptional intellect allows him to grasp languages and complex concepts rapidly. He aims to achieve his ideal rural life, which, for a vampire, involves overcoming sunlight sensitivity. He trains by intentionally exposing himself to sunlight, enduring painful burns and regenerating with blood, much to the dismay and eventual acceptance of his family and the maids. His parents, recognizing his unusual nature and strength, encourage his development, even if it means unconventional training methods.
The narrative also introduces the world's history and mythology, revealing a world with gods, ancient wars, and the concept of "demi-gods" descended from powerful beings. Noel's unique characteristics, such as his odd-colored eyes and his parents' extraordinary abilities, hint at a significant destiny. He learns about the "Golden Wolf Brigade," a legendary group his parents were part of, and the dangers of his lineage.
As Noel grows, he continues his training, mastering blood manipulation and developing a remarkable resistance to sunlight. He forms a close bond with Ridley, his primary caretaker, who, despite her initial shock at his unusual abilities, becomes fiercely protective. The story highlights the eccentricities of the Estrand family and their domain, where extraordinary events like wyvern attacks and vampire children enduring sunlight exposure are treated with a surprising degree of normalcy. Noel's journey is driven by his desire for an ideal rural life, a goal that becomes increasingly complex and extraordinary due to his vampiric nature and the unique world he inhabits.
