In one pond lived a water spider named Mon -mon. Spider dreamed to swim freely, without fear of enemies, but it is very dangerous, and he preferred to hide in algae. One day, collecting air bubbles to his new home, he met a beautiful woman, water strider. Mon -mon was fascinated by it,and she, of course, tried his uzhalit.Kak once with water strider was a trouble, and our hero to save the poor thing; but then she runs away from him. Will the two beings from different worlds - one underwater, other surface - to find happiness in this cruel world? Short film is specially designed for broadcast studio Ghibli Museum.