After learning about her human self and the events that transpired in Friendship Games, Princess Twilight Sparkle and Spike make it a mission to learn more about the humans that Sunset has lived with for years. Everything seems to be moving along swimmingly, but when magic begins to terrorize the Rainbooms from an outside force, the two Equestrians learn that a lot has changed since that fateful night during the Fall Formal.

Meanwhile, Sunset Shimmer's human counterpart is preparing for the investigation that would either launch her career to new heights, or destroy it in an instant.