In the world that Laura is living in, a world completely separate from humans, only vampire races live. They exist as real people until the age of 20, on every full moon night of the year they turn 20, they will change little by little to transform into a vampire and each will have a superpower. own force. The life of vampires is not much different from humans, but the food source after they deform will be red syrup taken from the sap of a rare tree species, called Sila. Particularly the black vampire race, get their nutrition from fresh blood. Laura is a great mystery about the vampire race that everyone yearns for.