Once again, Nobita has the urge to escape his home. However, he discovers that there is no place where he can go. Every corner of land belongs to someone or the other. Surprisingly, his friends, including Doraemon, also desire to flee. After brainstorming, they conclude that the only option is to travel back in time to a period before the existence of humans to find unowned land. To their astonishment, they end up aiding a prehistoric boy's rally against Gigazombie, seeking to save his tribe.