Every evening, Bou sees Zibou leave the nest. And even though he knows Zibou always comes back, it's never easy to see him go. He too longs to leave, to learn to fly, to take flight. So he won't be alone, to discover the world, to leave the nest, to grow up! A poetic show that accompanies young and old alike on the path of separations, these necessary steps for growing up with confidence and gentleness.