Every day, Yakov takes his sisters to the park. He's supposed to look after them, but their games are boring, so he reads about space and dreams of becoming an astronaut instead. His father, though, has other plans: he wants Yakov to take over his grocery store when he grows up. Yakov's world changes when at the park one day, he comes across a girl also reading a book about space. Aa has moved into the house right behind his, and the two become inseparable. Together, they search for constellations, check out astronomy books from the library, and marvel at the night sky. However, their fathers fear they are growing too close. They are forbidden from spending time together, and Aa eventually moves away. Years later, Yakov has achieved his dream: he works for NASA and builds space probes. Will he and Aa ever see each other again?