Long ago, a war broke out in Japan that pitted Kantou against Kansai and divided the country. Kansai became dependent on Kantou, but slowly the police and government began losing control of Kansai to criminals known as Akudama.

Upon hearing about the story of Treasure Island, Nobita dreams of discovering and exploring his own treasure island, despite the fact all of the Earth has been mapped already.

With demons reawakened and humanity in turmoil, a sensitive demon-boy is led into a brutal, degenerate war against evil by his mysterious friend, Ryo.

Fourth-grader Nobita Nobi tries to improve his present life so that his loyal cat robot, Doraemon, can return to his home in the future.

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. They meet a girl from the Rokkoro tribe and a boy who looks exactly like Nobita on Beremon Island ...