A mysterious meteorite struck the earth bringing with it strong radiation and large amounts of cosmic origin force. The world was in a crisis of destruction, but the strange energy activated the world, and many species began their evolution. Some humans also manifested special abilities.

It is now the world of great calamity. Humans were no longer the rulers. Powerful Mutant Beasts ruled 80% of the world’s territory. In order to survive, humans created two major occupations, Mecha Master and the occupation formed by the contract between humans and mutated beasts, known as the Combat Pet Master.

Su Yun, a teenager with a humble upbringing, ventured out beyond the protection of the city in order to find himself a Combat Beast. After surviving the many perils of the wilderness, he obtained a combat beast and also awakened the bloodline strengthening system, starting his journey of becoming a God Beast.