After a horrible day, in which everything that can go wrong goes wrong, a special letter goes to the Princess. And, what a surprise, it's not written by the mane six. I's written by...
Wait, what?
Oh, and what a day. Each one of the mane six (and Big Macintosh and the Cutie Mark Crusaders) have a story about it. And all of them are related. How? Well, the letter explains everything.
But it's a long one...