In 2060 AD, the release of the gene serum "X-V," developed by the mysterious organization "Mo," caused every living organism to mutate into a monster. Humanity took a series of measures to fight back, but mistakes and conspiracies caused many plans to fail. In particular, the failure of the [Pole Plan] completely froze the North and South Poles, while almost all the atmosphere was drawn to the poles and trapped there by the "Polar Stations." Everywhere else was scorched under the direct sunlight, and unmutated life forms came close to extinction. The changes to Earth caused by this chain of events were called the "Heavenly Aurora." Afterward, Earth entered the "Aurora Era," which the surviving humans also called the "Apocalypse" and the "Post-Apocalypse." The story of Against the Light takes place after the apocalypse.
