Luna is really, really, really bored. But Celestia is being a meany, grumpy hooves and won't play with her. She's told to play by herself but that's impossible. Can a filly really play by herself? Of course not! That's what big sisters are for, right? To play with you when you're bored.

But things change when Luna discovers the ultimate power of the universe, imagination. Now she has the power to create and destroy at her very whim. And she knows just what to do with it. There will be adventure, silliness, and mushy stuff. What grand adventures await Luna in her imagination?