Zero.

Summary

In a world where Zero's terrifying power dwarfs that of the savages, he instructs them to gather their tribe. The savages, lacking elders, respond to his call and absorb basic medical techniques and martial arts through a golden crystal, enhancing their survival. Over thousands of years, they evolve, developing language and writing, establishing a primitive civilization. Internal conflicts arise, leading to the emergence of clans. After 25,000 years, Zero returns to find a tribe that has progressed significantly. A child recognizes him as a traveler, reflecting their newfound understanding of the world beyond their village.

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