20 years after the CHS girls' graduation - and the tragic passing of their friend Sunset Shimmer, Professor Twilight Sparkle and Spike found Sunset's journal, with a message from herself... "Please help Sunset." [Rainbooms vs Mane 6]
Chrysalis’s second invasion was an incredible success—Equestria has fallen, and it seems like there isn’t anypony left to save it. But when Chrysalis stumbles across a mirror in Friendship Castle, it might not be ponies she has to worry about.
When Cloud Kicker's new magical powers malfunction and result in a dangerous situation for herself and others, she must go to Equestria to find a solution.
When Equestrian help is required in the world of Canterlot High, but Princess Twilight isn't responding to the journal, five girls cross over to find her. (All epilogues now complete!)
Princess Twilight Sparkle feels the need to get away from her royal duties for awhile. Her counterpart wants to see Equestria for herself. This whole plot seems rather familiar...
After ascending to princesshood, there was still the matter of Sunset's official coronation. Of course, she was going to invite her friends along for the event. It went about as well as you'd expect.