Set in a seaside town on the Italian Riviera, Luca follows the story of a young sea monster named Luca who experiences an unforgettable summer with his new best friend, Alberto. Together, they explore the surface world, face challenges, and discover their true selves while hiding their underwater identities from humans. The boys' bond is tested as they come to terms with friendship, fear, and acceptance in a beautifully animated coming-of-age tale.