When a curious mouse stows away aboard a ship, he meets another mouse that asks him to save his people from the terrible weasel that has taken over the island.
Saitou Atsuo
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The final chapter of the Gamba saga, released in theatres 15 years after the original TV series.
Gamba and his friend Manpuku are city mice who meet an island mouse Chuuta and set off on a journey to save Chuuta's island Yumemishima from the rule of a fierce white weasel named Noroi.
Source: ANN
* Based on children's books by Saitou Atsuo. Re-edited from a 1975 TV series.
When a badly injured mouse staggers off a ship in Tokyo Harbor, he tells the local mice that he has escaped from Devil's Island, where Noroi, the evil white weasel, has crushed the mice with his reign of terror. Tough-guy Gamba rashly promises to help depose Noroi.
Source: The Anime Encyclopedia