Aisabeth is the Chosen One to free the human world from the slavery to which it has been subjected. For this she will have to find a precious stone and set it in the Key of Freedom that hangs from her neck. She cannot do this alone, she will have to join her life to that of a centaur and fulfil the Prophecy: 'life at a blood price, union of wills that will open, forevermore, the Gate of the Kingdom.' Will she overcome the desire for vainglory that separated her from Eliseo? Will he be able to abandon his animal brutality and give his life for Aisabeth?