Marina, Roberto and Chico love when it rains. Not exactly the rain, but the magic moment when it stops and the rainbow appears, falling slowly from the sky, creating thick lines in different shades. And it is in that moment that children start to notice the colors of the world and play with them. Each color becomes a game of words and images. However one day, when the rain stopped and the drops still fell from the sky, there was no rainbow. The friends decide to investigate this mystery. They collect meters and meters of cloth and with the help from friends and neighbors they make a giant rope they will use to climb into the sky. There, they discover a transparent palace, inhabited by an old witch, who decides to erase the rainbow.