Rainbow has been feeling uncharacteristically down about herself lately. The ponies she's been interested in seem to gravitate towards more feminine mares, and she's convinced that if she wants to find somepony to love, she needs to work towards that ideal. In her efforts to improve her chances of finding love, she finds a book full of questionable spells that infects the mind of anyone who reads from its aging pages. She has no idea what the book may hold, but it promises to give her what her heart desires most.

Will her friends figure out what's happening in time to help, or will they lose the Dash they know and love forever?