It’s been over a decade since Twilight Sparkle lost her life. Everypony has moved on, but Spike has retained a special part of her body for safekeeping. Once a year, the lonely dragon gets to hold it and feel her magic again.
Twilight gets more than she bargained for when her best birthday celebration ever quickly turns into a nightmare. Twilight discovers that some things are even more valuable than friendship.
Luna has fallen into a deep state of depression. Celestia tasks princess Twilight to befriend Luna in hopes that she may return to normal. But Tragedy ensues when Luna coaxes Twilight to break the rules Celestia had set forth.
Princess Celestia receives a letter from her student, Twilight Sparke, who is slowly dying from horn cancer. Twilight Spakle also sends along a final gift to Princess Luna. But something is different about the flower that grows from the gift.........