In a dark world, dominated by vampires; a world in chaos due to countless wars. Now all that remains is blood and vampires, the remnants of human civilization are only treated as pets and food.
A noblewoman of impure blood, today as her 100th birthday she allowed herself to buy a bag of blood.
He, a boy who wishes only peace for himself.
Their destiny today brings them together, to support each other and to face this world where blood is the most important thing.