Hearth's Warming Eve is not Marelyn's favorite time of the year but after an unsual visit in a dream from Princess Luna he gets a second chance to set things right in his tormented love life and start over to find true happiness.

It is the eve of the Summer Music Festival in Ponyville but something's out of place! It is up to Lyra , Twilight and Pinkie Pie? to save them from a powerful illusion created by a mysterious outsider.