Allen was raised up in the underworld, the bottom part of the megacity where people thrive for their own survival. One day he pick up an abandoned experiment, Noel, which later led him to unravel the secret of Ayothaya (the part of Apex floor of this gigantic city). In 2177, every civilization already vanished from the catastrophe of global destruction. There's no land, no heat, but a turbulent sea surrounded by rings of fire in every place on earth.