The Bing Bong Book (a.k.a. An Imaginary Friend) is an illustrated storybook based on the world and characters of Inside Out, featuring Bing Bong as the titular character.
Bing Bong is lonely after not playing with Riley for so long, and wants to have a tea party with his friends. However, he runs into many problems along the way. Will he still be able to have the party?