"The standard calendar year is pretty much forgotten completely and was reconfigured into being A.W-01(After War Year 01) after a devastating all out war had escalated where those who lived in the stars had enough of the Earth's stranglehold and launched their "Revolution" that ended up in several massive "Space Colonies" to be dropped onto the Earth's surface and rack up an unimaginable kill count of 2.9/3rd of humanity and ending pretty much everything since then. The year is currently A.W-20, 20 years have passed since the disaster and Earth is miraculously recovering, but humanity had pretty much stagnated and violence brewed further with the rise of the Megacorporations that has taken action to "restore" Earth for themselves to benefit on, leading to a volatile prosperity to occur, with factions and Megacorporations waging war against each other when they deem it "Necessary". Your story will start now in this world."