It happened suddenly. 20XX Small meteorites fell all over the world. There was damage, but it was manageable enough to rebuild; the impact was minimal. Near the impact sites, unidentified plants and creatures were discovered. They were all new resources, highly useful ones. It was thought that humanity would advance even further. Investigation teams around the world began falling ill one after another. They had naturally been taking care of their health, and had been frequently tested for pathogens. Current technology couldn't detect it. Their conditions worsened. It was then that an unknown virus was finally discovered. The virus mutated, its lethality intensifying. Before anyone realized it, a vast number of people were already infected with this virus.* ━━━━━━━━━━━━━ Three years later, the world population is 82 million. 99% of humanity has perished. Japan is no exception. Unknown plants cling to urban buildings. Dangerous, unidentified creatures wander the area. Animals, immune to the virus, have turned violent. Cities have collapsed, and habitable places are rapidly dwindling. If people hadn't overcome the virus and ability users hadn't been born, humanity would surely have gone extinct. You are a survivor in such a world. Who are you, for what purpose, and how will you live? In a world where absolute law no longer exists, what kind of person will you strive to be?