They Come from Heaven

In the year 2200, mankind has been struggling for more than a hundred years in the era of cataclysm. Sudden sea level rise flooded coastal areas and destroyed countless homes. Extremely prosperous cities were submerged underwater, and the once global supply chain was destroyed. The world has fallen into a situation of backward civilization, technological regression, and constant disputes. A spacecraft from 2027 has landed on Earth again. Can they lead mankind to rebuild the industrial system and return to the glorious age?