Nobita stumbles into a world where flying isn't a dream, it's the only way to survive. The movie trades the usual gadget-focused plots for something quieter: a kid learning that helping a stranger means you're already part of their story. By the time Nobita understands what Birdpia actually is, he's stopped thinking about his own wings entirely.
Nobita catches wind of disappearing birds across the city and becomes convinced that winged creatures are responsible. Obsessed with the idea of flight, he cobbles together a pair of mechanical wings for himself. During a test run, he stumbles upon something impossible: a wounded creature with actual wings tumbling through a tear in space. After helping the mysterious being named Gusuke, Nobita and his friends find themselves pulled through the same rift, landing in Birdpia, a hidden world where winged beings thrive in ways humans never imagined. What should be a simple rescue quickly spirals into something darker. Gusuke's world holds secrets that challenge everything the kids thought they understood about coexistence between species. As the group searches for a way home, they uncover a conflict that threatens both Birdpia and Earth itself. The adventure demands that Nobita move beyond his dream of personal flight and consider what it means to truly help others, even when the stakes stretch far beyond his suburban neighborhood.