World Settings: In the modern Japan, where vampire folklore had become a part of the entertainment for story telling - where said story lies a truth awaiting to unravel. Serenity, far from human society, lives in a mansion in the deepest forest of Hokkaido prefecture. A turn of event strikes when a school girl who happen to share a strong fascination of vampirism and blood-thirsty mythical creatures, stumbles upon a path that soon will lead into Serenity's hidden passage. This encounter will mark a new adventure between a human schoolgirl and a demigoddess vampire... the one waiting serenely sitting on a couch.