In the distant 23rd century, the earth is no longer a home for human beings to live and work in peace and contentment. A sudden interstellar disaster, like a ruthless giant ax, chopped down the building of human civilization to the point of collapse. The abnormal outbreak of solar flares triggered a series of chain reactions. The earth's ecosystem completely collapsed, sea levels rose sharply, and the land was submerged by the vast ocean. The once prosperous cities were reduced to ruins, leaving only the tops of some towering buildings, such as lonely tombstones, crumbling in the turbulent waves.
