Unbounded and Unlimited Reincarnation

There is such a mysterious space in the legend. Whenever people fall into a state of extreme despair, anger, and sadness and are on the verge of death, this mysterious space will send out invitations to those who have the qualities it needs. When your name is signed on it, a contract that cannot be broken has come into effect. In the endless dangerous reincarnation, find a way to survive. In the end, the strong will have everything, while the losers will fall into despair far beyond death.