Life as a goddess is no simple matter, as Luna has discovered during her first few years in Canterlot. With her waking hours dedicated to winning Equestria's trust, Luna finds little time to enjoy life. As Celestia begins to worry about her sister's near-fanatical devotion, she hatches a plan to give—and take—her time off.

Luna is going to learn what being a "little" sister means, whether she wants to or not.