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Following an argument, Nobita follows Doraemon to the North Pole where he finds a strange ball that causes pieces of a giant robot to fall from the sky. After the pair builds the robot in the uninhabited Mirror World, Shizuka accidentally destroys a building with its weapons, and they decide it's best to abandon the robot and keep it a secret. The following day a mysterious red-haired girl named Lilulu begins to enquire about the robot, but after swearing Nobita to secrecy and borrowing the portal to the Mirror World she disappears. A few nights later Nobita follows a strange light and finds the portal to the Mirror World, though when he and Doraemon enter, they discover that Lilulu is building an entire army of robots! As the only ones to know of her plan, it is now up to Nobita, Doraemon and the gang to stop the Robot Empire's plan to invade Earth and enslave humanity.
After Suneo bragged about having a ranch, Nobita was asked whether or not he has one, pressuring him to say yes. Doraemon won a number of lotteries for useless planets in the belt between Mars and Jupiter. When Suneo and the rest came to see the ranch, Nobita happened to read the last of the lottery number to the go-anywhere-door, leading them to a huge dreamlike area. As Nobita's toy horse pranced around because of the wind-up life gadget, Suneo and the others became interested in doing the same to their toys and let them live in the area. So they decided to make their own clockwork city.
Nobita has been having a weird dream about a boy named Roppel and his strange companion Chami traveling in space. By a twist of fate, he met them in person where it turns out that they are real and that they were being pursued in space, causing their space vehicle to malfunction, connecting the space vehicle itself with Nobita's room. They journeyed to Roppel's planet and amidst their enjoyment, Nobita and Doraemon pledged to help Roppel's planet free from their oppressors.
Nobita and his friends gathered at Shizuka's house when they heard about the news about missing flocks of bird species. Nobita believed they were taken away by winged creatures and became obsessed on flying on his own. He created mechanical wings and upon the experiment he encountered an actual winged creature flying out of a time-space distortion. Upon helping him whose name is Gusuke, Nobita and his friends were sucked into the distortion and reached Gusuke's home, Birdpia or the world where the winged creatures live.
During class, Nobita questions the teacher where heaven is located when he was being taught about clouds. Being laughed at, Nobita looks for proof that a heavenly place exists on the clouds, but was explained by Doraemon that it cannot exist scientifically. Disappointed, he was eventually helped by Doraemon to create their own kingdom of clouds. Little did they know that there are creatures who have been living on clouds for a long time.
While trying to decide where to spend three days of their summer vacation, Doraemon suggests Nobita, Shizuka, Suneo, and Jyaian an underwater adventure. While exploring the ocean, they end up discovering a civilization that has been avoiding contact with the surface nations for several thousand years.