After war wipes out the human race, the only people left in the world are government made super soldiers. Human animal hybrids, fast, strong and near impossible to kill. The youngest is the self named "Devil Spy" whose been sent on a job by his superiors. He spends his days cleaning apartments in the city to make them habitable for the other hybrids. But he grows weary of his job... until he meets a human survivor named Wyatt.