Momo is a princess of , "the land of dreams in the sky". Fenarinarsa is a dwelling place for fairy tale characters. It was in danger of leaving Earth's orbit and disappearing, because people on the planet lost their dreams and hopes. The king and queen of Fenarinarsa sent their daughter Momo to Earth to help the people regain them. Momo became the daughter of a young childless couple, accompanied by three followers with the appearance of a dog (Sindbook), a monkey (Mocha) and a bird (Pipil). On Earth, Momo takes the appearance of a teenage girl. To help the planet regain its hopes and dreams, Momo transforms into an adult version of herself, with an occupation tailored to fit the situation (airline stewardess, police officer, football manager, veterinarian, and many more). Each time Momo succeeds in bringing happiness to the person affected, the Fenarinarsa crown shines. When it shines four times, a jewel appears in the crown. Once twelve jewels appear, Fenarinarsa will return to Earth.