Yugo was the son of the mercenary, Yuji. One day he is informed that his father has been killed while out at war. Yugo starts to doubt the circumstances of his father's death and decides to investigate it himself. It's at this point he comes to learn that he is a Zoanthrope and that his father was involved in a conspiracy with a multinational corporation called Tylon. To find out the secrets behind Tylon and to find out what actually happened to his father, he sets out against the evil company.