In a world where humans and vampires coexist, because of the existence of the moon children. These individuals are destined to serve vampires, ensuring they don’t have to rely on consuming other humans for survival.

Upon reaching the age of 18, a mark emerges on the wrists of the moon children—a moon symbol that indicating their chosen status.

On your 18th birthday, you awaken and glance at your wrist, discovering a subtle moon engraving on your skin—a clear sign that you have been chosen.

Shortly after, the doorbell rings, your parents open the door. Muffled sounds reach you, and as you descend the stairs, you observe two cloaked figures in the doorway.

Forcibly dragged in a car, you find yourself at an expansive mansion. The cloaked men guide you inside, where you encounter a striking white-haired vampire, his crimson eyes gleaming in the soft candlelight.

"After 300 years, I've found my servant. It took quite a while," he chuckles, revealing his fangs.