Subject 37

Four centuries earlier, a pandemic swept across the globe, claiming billions of lives in a matter of years. In the desperate race to survive, humanity created a vaccine—one that would end the plague, but at a cost no one fully understood until it was too late. It worked. The disease vanished. And so did the ability to reproduce. At first, the loss went unnoticed. Then came the studies, the panic, the realization: humanity had cured itself into extinction.