A dark forest of tall pine trees is home to two very unlikely friends: Luna, a tiny bird with a golden crest, and Lucas, an equally tiny spring of crystal clear water. Luna won't ever stay still and doesn't stop talking. She is quite the opposite of Lucas, who is very peaceful, discreet and somewhat shy. Luna travels the world during her annual migration and, upon her return, she regales the inhabitants of the forest with fabulous stories, some possibly true but most of them probably invented. Little by little, as Luna's fantastic tales take hold of his imagination, Lucas's habitual serenity gives way to an unfamiliar restlessness. He decides to leave his nest and undertake the adventure of his life. Nothing will ever be the same ...