A lie about owning a ranch spirals into stumbling through an actual dreamland that shouldn't exist. Doraemon's junk lottery prizes become the gateway to a place where toy horses run wild and the rules are whatever the wind-up gadgets decide they are. Kids watching this don't need the world to make sense, they just need to see what happens next when nobody's paying attention to whether any of this was supposed to work.

Nobita finds himself in a familiar predicament: Suneo is boasting about his ranch, and when the others ask whether Nobita has one too, he feels pushed into saying yes. Doraemon, meanwhile, has won several lotteries for worthless planets in the belt between Mars and Jupiter. When the friends come to see the ranch, Nobita reads out the final lottery number to the go-anywhere door, and it opens onto a huge, dreamlike land. There his toy horse bounds around under the power of the wind-up life gadget, and Suneo and the others want their own toys brought to life and settled there too. Together they set out to build a clockwork city of their own in this fantasy film.