Celestia is a benevolent ruler, where everypony wants to follow her by her good example. Luna had always noticed that and made her uncomfortable, because she began to wonder if there were ponies that were loyal to her.

One morning, she goes to her sister and asks if there are ponies that are loyal to her. Celestia didn't want to end up lying because she wasn't sure, so Celestia and Luna go to the Mane Six to do a personality test to find out which of the mares were loyal to Luna.

Each mare in the group is loyal to a princess. But none knew who royal to was to whom. And when each one reveals, Twilight Sparkle discovers that not all her friends are loyal to Celestia.