After the Death Dust Disperses

In the second half of the twenty-first century, human civilization stands at an unprecedented peak. Helium-3 nuclear fusion brings nearly unlimited clean energy. Super towers are thousands of meters high, and CityBrain AI manages everything from transportation to logistics. Maglev highways weave into a network fifty meters in the air, and underground logistics pipelines transport goods at hundreds of kilometers per hour. Gene therapy eradicates genetic diseases and biological bandages reduce wound healing time to days. Humanity truly believes that they are on their way to the stars. It wasn't until 2080 that the beings known as "Swarms" arrived in geosynchronous orbit. It's 2101 and the surface is no longer safe