In the eyes of God, the universe we live in is just a picture that He has casually altered. Every thousand years, the gods get tired of the old works, erase everything, and draw new ones.
The "Seven-Day Boundary Monument" is such a "waste draft" that is about to be erased.
This is not the underworld, but an experimental world created thousands of years ago by a world-weary "Painter God". The painter God wanted to create "the most perfect life" here, so he gave up on the seventh day of creation and allowed the creatures in the world to evolve on their own, euphemistically calling it "observation". He named this world "Fragment of Eden", and the creatures here called it "Seven-Day Boundary Monument" - because no one knew when God would come back and completely erase everything in seven days.
For thousands of years, the gods have never returned. The underlying rules of the world (made up of God's first brush strokes) begin to go haywire. The time and space here form a strange closed loop. In order to prevent the world from being completely annihilated, the core will of the world (similar to Gaia's consciousness) launched a self-rescue program: "Clear Reincarnation."
Every seven days, the surface space and time of the world will be "reset to zero". All lives that fail to "awaken" will have their memories and bodies formatted and fall into a new cycle like NPCs. Only those souls with strong beliefs or obsessions can retain a trace of sanity in reincarnation, and this lucidity is the key to becoming a "perfect life".
