Every year on the night of the Winter Solstice, Princess Celestia secludes herself in her royal chambers for a mysterious, elusive ceremony. Now that her faithful student Twilight Sparkle has blossomed into a mature young woman, Celestia has decided to allow Twilight to know her most closely-guarded secret.

Twilight is about to find out what happens on the one night of the year Princess Celestia is completely, utterly powerless.

(Cover adapted from a wallpaper by Megasweet)