In 2020, the geomagnetic field began to swiftly weaken.
That same year, in Asia, Plan A—constructing a simulated geomagnetic field—began.
That same year, in North America, Plan B—constructing the humans' underground city—began.
In 2030, the geomagnetic field disappeared, so the biosphere fell into dysfunction, the climate changed dramatically, and the solar radiation was abnormal. The "Desert Age" had begun.
In 2040, Plan B was successful, and the underground city was opened up to inhabitants.
In 2043, Plan A was successful, and a weak magnetic field covered the entire world.
In 2045, with the marine life of the Pacific Ocean at the center, species all over the world mutated. The "Calamity Age" had arrived, and the war began.
That same year, construction of the Northern Base and Southeastern Base were completed.
That same year, the Underground City Base assisted in the construction of the Virginia Base.
In 2050, in the war, humankind suffered tremendous losses, and the "Fusion Faction" was established.
In 2053, humans observed widespread genetic mutations, and birth rates plummeted.
In 2061, there was a mutant rodent upsurge, and the Southeastern Base fell.
In 2066, the women of humankind's four bases voted unanimously to pass the Rose Manifesto. The bases introduced a fertility scoring system, and women with a score above 60 signed an agreement with the bases to voluntarily subject themselves to artificial insemination.
In 2067, at the Northern Base, "Judgment Day" occurred. The Arbiter's Code was introduced. Holding the license to kill people, the Arbiter indiscriminately shot all who were contaminated.
In 2070, the Fusion Faction defected, and the Highland Research Institute was established.
In 2073, the Virginia Base fell.
In 2115, at the Northern Base, the "Rose Incident" broke out. Women united to revolt against the base's envious crushing grasp on fertility. The base suppressed it, and all women with a score over 60 were confined in the "Garden of Eden."
In 2135, communication conditions deteriorated even further. The Northern Base and Underground City baseclosed the daily communication channel, leaving only the emergency channel open.
In 2150, the Northern Base's population experienced steady growth, and the "Recovery Age" began.
In 2154, genetic examination technology matured.
The story begins.