Some escaped slaves, having mutinied, are hunted down and summarily executed by a ruthless state-sanctioned assassin even as they reach the end of their brief flowering of life. The killer is the human, the slaves are androids. The slaves kill to survive, but are also shown to take pleasure in the act. The assassin hates his job. It's the future so everything is morally ambiguous and sushi is in.
The last surviving mutineer, having turned the tables on the assassin, spares his life long enough to deliver an extraordinary speech about the wonders he had seen in his brief life, and his yearning to live. He dies.
The assassin, having fallen in love with another slave, runs off into the desert with her, even though he knows their life together will be brief.