The Story of the Chosen Son from Another World

In short, due to some reasons, all mankind, when technology developed for the seventh time to modern civilization, ushered in the seventh reincarnation into a different world. After all human beings were reincarnated, they discovered that they had forgotten all the text-related memories of their previous lives. Moreover, all races in this world, and basically all plants, animals and monsters were all reincarnated. A tragedy unfolded.