Doraemon: Nobita and the Winged Braves

Nobita and his friends were at Shizuka’s house when they heard reports of missing bird flocks. Convinced winged creatures were behind the disappearances, Nobita became fixated on flying himself. He built mechanical wings, and during a test flight, he spotted a real winged being emerging from a time-space rift. After helping the creature-named Gusuke-Nobita and his friends were pulled into the rift and transported to Birdpia, the world where the winged beings live.