のび太がひろった小さなロケットの中から、手てのひらサイズの宇宙人・パピがあらわれた！ パピは宇宙のかなたにある小さな星・ピリカ星の大統領（だいとうりょう）で、反乱（はんらん）軍から逃（のが）れるため、地球にやってきたらしい。スモールライトで小さくなってパピと遊ぶうちに、彼となかよくなったのび太たちだったが、パピを追って地球までやってきた反乱軍の攻撃（こうげき）に巻き込まれてしまう。責任（せきにん）を感じてひとりで反乱軍に立ち向かおうとするパピと、パピの故郷（こきょう）であるピリカ星を守るため、ドラえもんとのび太たちが立ち上がる…！
One day during summer vacation, a palm-sized alien named Papi appears from a small rocket that Nobita picks up. He is the president of Pirika, a small planet in outer space, and has come to Earth to escape the rebels. Doraemon and his friends are puzzled by Papi’s small size, but as they play together using the secret tool “Small Light”, they gradually become friends. However, a whale-shaped space battleship comes to earth and attacks Doraemon, Nobita and the others in order to capture Papi. Feeling responsible for getting everyone involved, Papi tries to stand up to the rebels. Doraemon and his friends leave for the planet Pirika to protect their dear friend and his home.
