After Doraemon, Nobita, Shizuka and Unicorn fall on a cliff, Unicorn gave birth to a pink unicorn. Sabu tells Doraemon to name the newly-born unicorn. Doraemon named her Momo. Doraemon guards Momo and her mother overnight and spot a Centaur lurking near them. He confront them and reveal themselves as Ken and Ros. They captured the unicorns. After Doraemon defeated the enemies, he and Momo hugged each other.