【明報專訊】One day in the 21st century, Nobita (大雄) comes up with the idea of running away from home again because he is constantly scolded at home and at school. Gian (胖虎), Shizuka (靜香) and Suneo (小夫) join him for different reasons. While they are discussing where to go, Nobita mentions a place where no human exists. With Doraemon's (多啦A夢的) help, they travel 70,000 years back in time to prehistoric Japan.