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Doraemon (voiced by Shibata Yuji) helps Nobita (voiced by Eimei Ohara), Jaian (voiced by Asahi Kimura), Shizuka (voiced by Yumi Kasajima), and Suneo (voiced by Tomoe Kishi), who are under immense pressure from their parents and want to run away from home, travel back to Earth 70,000 years ago. As they create their own utopia, they encounter a mysterious young boy named Guguru and get caught up in a tribal conflict between the Light Tribe and the Dark Tribe. Together, they unite to outsmart the formidable Jigenbi, only to discover a shocking secret...