Many years ago, the battle between day and night ended when Nightmare Moon was sent to the moon for trying to rule equestria. Many of her supporter and underground armies were either catchererd or have ran away. "Moon Diary" was one of them. And instead of being left in jail, Princess Celestia gave him a chance to renew himself by working in a giant Library that was once own by his grandfather "Crescent Summary". To this day and night, Moon Diary reads, writes and helps ponies of all races in need for a spell book, a history book or just a good read. No matter who you are, Earth, Pegasus, Unicorn, or Vamp/Bat pony, Moon Diary will always be around to assist anypony and to listen to their story.