Sunset Shimmer and Starlight Glimmer. Two ponies who are all too familiar with regret. Though they have just met, both can see a little of themselves in the other. After helping her friends stop the misguided rampage of Juniper Montage, Starlight is faced with another problem. Completely by accident, she uncovers Sunset's unrequited wish. To reunite with Princess Celestia.

With Sunset too enveloped in regret to undertake the journey alone, Starlight agrees to help. Pitted against their own doubts, will they be able to pull through or will Sunset's greatest wish go unanswered?