Doraemon: Nobita and the Birth of Japan

When a variety of circumstances leave Nobita, Doraemon and the gang wanting to run away from home, they face the task of finding somewhere to live. However, with every seemingly spare piece of land already owned by someone else, building themselves a house looks impossible – that is, until Nobita has the idea of travelling back seventy thousand years into the past. While the group are making themselves at home in an uninhabited Japan, back at home a glitch in space-time has sent a caveboy crashing into the middle of the city.