The shadow of disaster falls over the modern city. Unknown creatures surge beneath the ground, electromagnetic storms triggered by solar flares sweep across the globe, extreme cold freezes every corner, prehistoric beasts awaken in the darkness, and alien intelligences quietly arrive. At the edge of human society, what was once a thriving world is now a brutal 365-day countdown to extinction.
An office worker is unexpectedly transported to this parallel world, with only seven days left before the cataclysm.
Fortunately, he awakens a mysterious System and gains exclusive defensive facilities and self-enhancement skills, opening up the possibility of unlimited evolution.
An ordinary security door is gradually upgraded, from reinforced double layers to an alloy structure, and eventually into a high-tech portal capable of cutting through space...
A simple arrow launcher is gradually transformed into a light machine gun, then a storm-like Gatling gun, and finally a devastating barrage of photonic laser cannons...
In the research lab, tanks, fighter jets, submarines, unmanned reconnaissance drones, intelligent combat robots, satellite communications networks, and a nuclear-powered energy center all become part of his secret arsenal.
While everyone else struggles to survive in the ruined city, he is already using remote-controlled drones to strike with pinpoint accuracy from a safe distance at those who try to invade his...
I seem to have read this exact same novel somewhere. I have forgotten whether I read it on Tomato.