Rebirth at the End of the World: Sentenced to Five Hundred Years at the Beginning

The end of the world is coming, and natural disasters are coming. The world lost 70% of its population due to a flood, and then experienced various natural disasters such as extreme cold, extreme heat, and strong winds, resulting in a continued decline in population. However, when people survived the last natural disaster and saw the dawn, they did not know that that was the beginning of real darkness...