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 portal to a beautiful getaway run by tin robots. Best of all, the stay costs nothing. But the one who invited them there seems to be hiding a secret purpose, and the dream vacation may not be what it appears. A fantasy film in the Doraemon series.