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Nobita and Doraemon use time tree Mochi and catches a big bird Moa, which has been extinct for 500 years ago To protect extinct the animal, Nobita and Doramon go to Beremon Island which is protected by a golden beetle named Herakles

Doraemon and friends trying to save a boy name Kukuru and his tribe from Gigazombie who want to change history for his own sake in the ancient times