When Scientist Jorge Schiro discovers another world parallel to the human world known as the Beast World. The inhabitants are known as Primals, and they are happy to see the humans. the two races are about to make peace when the Primals King, Dodekadai-Oh, is poisoned with human medicine. At the same time, Jorge Schiro, who was being praised for his discovery, is poisoned by Beast World drugs. A war breaks out between the two worlds, cutting off any connection between worlds. That was two years ago, and now the humans have seemed to accept the fact that the Beast World is not to be touched. But as an alien empire linked to the event where war broke out returns to force the humans into a death game for their entertainment. The Primals King, Dodekadai-Oh, wishes for peace and sends four Primals to go help the humans. These Primals will meet Dodekadai-Oh's associate, a human named Liam Morgan. Will they stand a chance against this Death Game?