Because Totoo was originally a human, he has a navel even though he is now a frog. Finding out that a frog with a navel is living on a Southern island, Melmo and the party head there. On the island, a masked woman is giving villagers pollen as a medicine to make them regain their youth. Prof. Waregarasu, who accompanies the party, sees that the pollen contains narcotics. The navel of a frog is proven to be a stomach wart caused by narcotics.
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