Vampires world. What is the first thing that comes to people's minds about vampires? Creepy creatures that thirst for blood. People will think that way. Vampires can live a very long time, theoretically forever, which means their idea of getting down to business can be damn leisurely.

Vampires occur everywhere, but in busy cities no one notices. There comes a time for every vampire when the idea of eternity becomes momentarily unbearable. Living in the shadows, feeding in the darkness with only their own company to keep, rots into a solitary, hollow existence.

That's what people think about vampires. However, there are also those who do not believe in anything related to vampires, considering it a mere myth. One of them is Uchinaga Aeri, a young girl who prefers to think realistically rather than being carried away in fantasy and imagination like people in her age.

Believing in the existence of vampires is not stupid but useless things, for her. There are many things that are more real than vampires, but what if an incident causes her to be trapped in what she considers another universe? What should she do and how will she get out of that world? Not to mention that she had to solve problems caused by other people.

Here, everything changes for Uchinaga Aeri.