Nobita has to make a diary and record some multilevel process as a school project for holidays. He with the help of Doraemon, creates a new world and embarks an adventurous journey with his friends.
Nobita and his friends come to the largest amusement park in the universe by the space ship that is modeled on a locomotive. Although they play happily, they are attacked suddenly by unknown aliens.
Nobita and Doraemon got the small planet in a lottery. In which is blessed with rich nature, they infuse with spirit into their toys by "Screw"of Doraemon's tool, and build "Screw City".