[edited]
In a city far away—one that didn't exist on Earth but on another planet entirely—humanity had found a way to thrive once again.
This world, though alien in origin, was still habitable by humans who had long since conquered weather through the advancement of integration and advanced technology.
Well, mostly technology, to be precise.
On this planet, there weren't many cities. Just a handful, constructed in the most livable zones, carefully selected by data and climate simulations. Nature had not fully surrendered to civilization, but here—there were no wild beasts, no threats of alien fauna. It was safe. Or, at least, it seemed that way.
Throughout the city were men dressed in military attire, stationed in groups, walking along corridors, positioned by entrances and exits. To the average observer, they appeared as trained personnel, warriors safeguarding the populace. But truthfully, they weren't military men at all.