Quad #2

PSE-Trent
Quad is a series of four stories set in the same post-apocalypse universe.
This is the number two of four.
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In one of the last known cities of the world, robots are the man's best friend.
When a robot breaks one the three rules, it means it is possessed by an ancient virus.
Well, that's why we have the Paranormal Software Exorcists, after all.