The universe is too big and too old. The Milky Way is just one of the hundreds of billions of galaxies in the universe, the sun is just one of the hundreds of billions of stars in the Milky Way, and the earth is just a speck of dust in the solar system. Can anyone notice the tiny and short-lived lives that are wandering, crying, enduring, struggling, above that dust? They are us, the last children of the earth... - Xi, the descendant of the ancient god of the Arctic Ocean, - Yan, the blue servant of the Old World, - Xi, the man-made ancient god of the Pacific Ocean, - Yan, the red servant of the New World. All that we do, is it to continue to survive, or to end the pain? Or, just to prove our existence...