Fics like Filling an Empty World: Isekai Sandbox.

A highschool boy accidentally falls into an unknown portal while looking for paranormal activities in the woods. He spawned in a modern city, but no one's there, no human or animals or even bacteria. Plants and the structures of a civilization long vanished. In this world, you actually can spawn people and animal using shiny crystals. A Pink crystals lets you can spawn any human that you request to the pink crystals. While green crystals allow you to do the same for animals.

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