Doraemon and friends run away from their home and travel back in time to the 70,000 years ago where nobody existed to build their ideal private paradise. After they fully relished the freedom in the era, Doraemon and friends bid farewell to their paradise and come back to the present day. However, a few days after they came back home, Doraemon and friends bump into a caveman called "Kukul" in the current era. They fi...