The end is coming, and those who are unprepared to die in the early stages of the end can get the chance to be "resurrected" by completing the final copy and return to their original world.
Getting lost or dying in a copy means failure.
The time of return is after the end of the world, when mankind is rebuilding its homeland.
When chaos begins to die and civilization reappears.
Intent: Equality, friendship, tacit understanding, mutual help