When you spend your entire life with one person, it can become difficult and even frightening to imagine what things might be like without them. For the ponies of Equestria however, they have the benefit of mortal existence to ease such worries.

This is not the case for a young Princess Celestia. She has lived nearly every waking moment with her sister Luna until tonight. Now, she must face the reality of going on without her by her side, and come to terms with the part she had to play in her sibling's fall from grace.