Wendy and her two little brothers are brought to the land of adventures called Neverland by Peter Pan, a boy who will never grow up. In Neverland, they encounter exciting events and meet with little fairies, mermaids, Indians, and pirates. Required to act as a mother, Wendy never has a moment of peace with all that is happening around her, including breath-taking fights with pirates. Later in the series, they set off to find buried treasure with a map they obtain from the pirates.

Source: AnimeNfo

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Full story: Peter Pan no Bouken