‏500 years ago, a endless number of monsters appeared out of nowhere, and took over the world. They were called “empties”. Monsters that fed on the hearts of humans. They were lead but their great king “the devil” ruler of flames. But, a miracle happened. Seven royal families fought and win against the mad king, bringing back the peace that was once lost in the real of humans. Our heroine, “Mallory” meets a boy who is full of mystery, and far from anything she has ever encountered in her life. But she couldn’t realize that the both of them will carry the fate of the world on their shoulders.