it has been 10 years after several nuclear silos in the US mysteriously detonated, killing millions and initiating a nuclear winter that would last for decades.

The radiation caused a mutation in humans and animals near the ground zeros of the detonations, causing their DNA to fuse and turning them to turn into anthropomorphic animals. Mysteriously, their conditions are contagious. some are dangerous from the mutations, while others are friendly. goal is to survive.