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 a desperate lie tumbles from Nobita's mouth before he can stop it. When his friends demand proof, he scrambles to make good on his promise, enlisting Doraemon's help. A mistaken lottery ticket transports them to a vast, untamed landscape, and suddenly an impossible solution presents itself. Using Doraemon's wind-up life gadget, Nobita animates a toy horse, and its spirited movements captivate everyone. What begins as childish experimentation with a single toy evolves into something far more ambitious: the children decide to populate this empty world with their own creations, building a miniature civilization of mechanical beings and whimsical structures. But maintaining a clockwork city proves more complicated than they anticipated. As their mechanical inhabitants develop unexpected behaviors and the world takes on a life of its own, the kids confront questions about creation, control, and what it truly means to nurture something you've brought into existence. This film blends wonder and heart, capturing that particular magic of childhood where imagination collides with responsibility.