A midnight ad nobody remembers booking becomes the doorway to a resort that shouldn't exist. Doraemon and Nobita stumble into a mystery where the rules don't match the world, and every answer about how they got there matters more than the vacation itself. The movie trades the usual gadget-chaos formula for something quieter: the specific dread of realizing you're somewhere you can't explain, with people who might not be what they seem.
Nobita's father answers a midnight television ad for an impossible resort and books a vacation without fully understanding what he's doing. When the family searches for the place the next morning, it doesn't exist anywhere on the map. Then a mysterious suitcase appears in Nobita's room, containing a shimmering portal to a luxurious getaway run entirely by tin robots. The catch? It's completely free, and no one can explain how any of this is real. As Nobita and his friends settle into this mechanical paradise, strange details begin to surface. The resort feels too perfect, too isolated from the outside world. Their host remains hidden, and the robots grow increasingly evasive about basic questions. Something doesn't add up. What starts as a dream vacation transforms into a puzzle box of mysteries. Doraemon must use his gadgets to uncover the truth behind the resort's existence and who really benefits from luring families into this tin kingdom. Reality and illusion blur as danger creeps closer from the shadows.