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From a stumbling lion cub to a majestic lion king, he imagines that his life as a lion would peak and end with him owning a vast territory, dominating the grasslands, terrifying all his enemies while having many wives and concubines.

Unexpectedly, his life as a lion has just begun.

The Earth's energy has mutated; all kinds of mutated creatures are attacking, and humans have fallen from the top of the food chain, and the African grasslands fall into a crisis.

And he, too, is gradually becoming stronger through evolution and mutation.