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Synopsis

Nobita decides to leave home again but discovers every parcel of land already has an owner. His friends, joined by Doraemon, contemplate running away as well and conclude the only place without private ownership is the distant past before humans claimed territory. Using time travel, they journey to a prehistoric era where they encounter a young cave boy whose community is imperiled by a monstrous force called Gigazombie. The group becomes involved in aiding the boy and his tribe, facing dangers of that ancient world while trying to find a place free from ownership.