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What will the world look like in 300 years? Interstellar armor? Cyberpunk? High-dimensional civilization? Unfortunately, neither is the case. The world 300 years from now is a wasteland filled with alien beasts. Human beings in this era are huddled within the high walls of their bases. Inside the high wall, the people at the lower level are barely surviving, while the people at the upper level are well clothed and well fed. And all the sins that caused all of this were gathered in one person. "Is it my sin, or is it the sin of the world?"

Every time you die, you can be reborn in another world with your memories and abilities. Every time he is reborn, he has a different identity. This is a trial after trial, a trial with no tasks and no end point. Where do soul stations and serial existences come from and why do they exist? This is the story of a traveler from all over the world. He traveled through different time and space, experienced different lives, and recorded different stories...