Abandoned by Earth, a near-extinct humanity was forced to live within a single, destroyed city, the city of Panceia. Isolated and trapped they could no longer affect the rest of the world, with any human left outside brought to the city. As the last human outside of Panceia's walls entered the city —making 100% of humanity inside Panceia— he was offered a deal by Earth itself. Chosen by Earth, Airot faces off against his own kind. Finding some allies and surrounded by enemies, each motivated by their own reasons, the defenders of Panceia clash against Earth's followers.