Through linked episodes and lyrical reflections, the narrative follows Caillou and Tili as they move from childhood into early adulthood, mixing humorous anecdotes with keen observations of nature and society. Scenes range from intimate, sensory meditations on the return of spring to domestic and social situations that probe questions of identity, vanity, and growing self-awareness. The tone shifts between playful irony and tender observation, using seasonal imagery and small-scale incidents to illuminate characters' feelings, social mores, and the awkward gestures of maturation.