In the not-too-distant future, the air on Earth has become unbreathable. However, a multinational company called Air Co. has constructed generators that provide oxygen for those who can afford it. Peace Dog, a desperate ex-soldier, who has been willing to do anything to obtain breathable air is haunted by his past and hunted by bounty hunters, though, he may have found a way out of his current predicament by helping a mysterious robot child escape the dangerous and congested city. But, someone from his past has no intention of letting him leave…alive.
Peace Dog was able to survive a war by making a deal with Death itself. Part of that deal would be that he would live a life of solitude…his payment for committing atrocities during the war. However, Peace Dog has broken this pact by helping a robot, named the Kid, across a dangerous and barren wasteland to a place where the Kid believes they can find some semblance of hope. However, Peace Dog is not only on the run from Death but also a bounty hunter who will stop at nothing to take him down!