出木杉から、鳥人伝説の話を聞いたのび太は、空を飛ぶ実験をしている途中で、翼の生えた鳥人間・グースケとぶつかってしまった。
ドラえもんに人力飛行機を修理してもらったグースケが、再び飛び立つと、突然、空に大きな穴が開き、みんなも吸い込まれてしまう。
穴の向こうには、鳥人間の世界“バードピア”が広がっていた！
After watching a televised showing about supposedly humanoid birds spotted in Africa, Nobita dreams of being able to fly with wings. He builds wooden wings after Doraemon refuses to help him, though he repeatedly fails to fly using them. While helping Shizuka to reclaim her pet canary, they witness a portal opens in the sky and a humanoid bird riding an airplane coming out. He introduces himself as Gusuke, a humanoid bird who lives in "Birdopia". Doraemon, Nobita, and Shizuka help Gusuke fix his airplane, where Nobita becomes fast friends with him. As Gusuke departs to his home, Gian and Suneo catch him and grab his plane. The other three follow them through the portal.
