Our favorite Pink pony makes a mistake when she lets her friend, Rainbow Dash, die from choking on a sour candy. She knows no-pony will believe her if she told them she didn't kill her, especially after all her friends read cupcakes.
Meanwhile, up in the heavens, the Teenaged Mutant Ninja Turtles and I, Haruhi Suzumiya, narrate this story for the ninth time or so.
Usually the story ends with Pinkie getting arrested, but I think she deserves a happier ending. I inform Pinkie of her astounding ability to break all 5 walls of fiction, including the one you're familiar with, the 4th wall, and I ask of her to use this power to bring a happy ending to another story I'm reading that involves Batman and Robin getting into a battle over stupid reasons.
In turn, I'll give her the tools needed to bring Rainbow back to life.
The journey won't be easy. Batman and Robin have gathered powerful armies from all over the universe to kill each other. Not only that, but there is another army who seeks to let the battle end in a bloody stalemate, and will destroy anypony who gets in the way. Pinkie just so happens to be that pony. Will she die on her journey? Does it matter? This story has Batman shooting lasers out of his eyes!!!! Shut up and read.