On Saturdays, a little girl and her older sister go to the pool. But lately it's been different--her sister doesn't want to play anymore.
She'd rather sit poolside with her friends. Has she forgotten the magic? The little girl decides she can just have fun by herself. She plunges into the pool and makes friends with all the magical creatures underwater, like jellyfish, crabs, turtles and a wise octopus. Together they dance and play. Still, the girl can't help but think of her sister. So she decides it's time to go back. Maybe it's not too late to show her sister the magic all around them. Once her sister sees her again, her big sister remembers all on her own. Because the magic isn't just around them--it is them.