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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.