Normally, Twilight would like to reading books or parchment instead of writing it. But, she has her secret guarded inside her castle. Starlight, one of her students, wrote messages to a book with a sun emblem, which isn't like Celestia has, in front of it. She met Sunset, a mare who was exiled onto the so called 'human world', via the book and she liked to met her with four eyes. And she accepted.