In the soul of each of us there live many feelings and emotions. And in Riley's soul too! The most important of them are Joy, Sadness, Fear, Anger and Disgust. They all play their role, but for a long time Joy was rightfully considered the most important. However, the girl grows up, and her feelings become more and more complex, as does the world around her. When, after moving, life in a new place does not work out, the reins of power in Riley’s soul pass to other Emotions, and Joy is accidentally lost in the girl’s complex inner world. And now she faces a long journey through the labyrinths of the mistress’s imagination and mind in order to understand that other Emotions are no less important than her. Meanwhile, Riley will have to find out what it’s like to live without joy and how to cope with it.