In the city where Nona lives, the Time Bureau watches how its citizens use time. The Bureau supervises those who are wasting time or using time incorrectly. Nona is unable to bear this and runs away from home. He meets a mysterious woman named Ninya, and begins life on her farm. One day, Nona obtains a seed of a star in exchange for his vegetables, and decides to grow it.
Source: Ghibli Museum