Playing games with friends is supposed to be fun, but it is not always easy when things do not go your way. Rainbow Fish and his underwater friends are enjoying an exciting game of hide-and-seek among the coral reefs. When another fish finds the best hiding spot and wins the game, Rainbow Fish feels his temper rising. Instead of congratulating the winner, he gets upset and threatens to quit playing altogether. Feeling frustrated, he swims away to sulk. Soon, he realizes that throwing a tantrum is a quick way to lose out on all the fun. With a little reflection and some gentle encouragement, he learns that everyone loses sometimes. He discovers that being a good sport and celebrating the success of others is the real key to keeping your friendships sparkling.