After Life: Isekai World of Migration

After life is death. This is a fact for all beings who are not eternal as even those with eternal youth will either face the end of a weapon, the end of civilization, the end of the world, or maybe just maybe the end of their universe.
Alas even those who die dont simply cease to be this is the story of many of those who made worlds revolve around them in life and will continue to do so in death.