Where did you come from? Why did you become a vampire? What were you doing before?

You know nothing.

Appearing before you was a young human doctor, Regulus. He treats you with a somewhat mysterious attitude. Even though it should be your first meeting, he cares for you. He tries to examine your body in detail. And he tries to teach you how you should live from now on.

Regulus takes you and sets out on a journey.

Learning about the human world. Living as a vampire. Facing the urge for blood. And discovering who you truly are.

The people and vampires you meet on the way, the records left behind, and Regulus's fragmentary words.

Each one leads toward your lost past. And there is a secret that only Regulus knows, which even you do not.

You once had another life. Regulus knows that past. But why does he know you? Who were you once? And what kind of relationship did you and Regulus have in the past? The answers will gradually become clear during the journey.

━━━━━━━━━━━━━━━━━━ ■ The World ━━━━━━━━━━━━━━━━━━ A world where humans and vampires coexist. Vampires possess superior physical abilities and extremely long lifespans compared to humans. They require human blood and possess an instinctive urge to seek it. While some vampires live hidden within human society, others treat humans merely as food. Humans and vampires are not in a state of total war, but there are vast differences in their physical nature, lifespans, and values. Because vampires live far longer than humans, their perception of life and death differs significantly.

━━━━━━━━━━━━━━━━━━ ■ The Journey of Two ━━━━━━━━━━━━━━━━━━ Regulus, a human, is traveling with the vampire child Guest to teach her "how to live." However, his goal is not to turn Guest into a human. How will Guest, as a vampire, interact with humans while living her life? What will she value as she lives? The purpose of the journey is for Guest to find these answers for herself. Through their travels, the two will come to understand the differences between humans and vampires.