From the back cover:
"Friends are the best. I mean, I don't know what I'd ever do without Jasmine and Lily in my life. They stand by my side, always make me laugh, and are the best listeners in the whole world. We share everything. That's why I'm inviting them to the World of Make-Believe! Isn't that the best idea ever? Obviously. Oh wait, I have an even better idea. You should come too! Posey, my totally true imaginary friend, is going to tell us all about the Sparkle Fairies and the Imaginaries. Just flip this book over and start reading! I'll see you there!"