Celestia has broken, Luna is missing, and only Seven can answer. The bronies who have been sent to this Equestria must save this broken land from Eternal Day.
Twilight panics when she discovers that Princesses are expected to have formal dates for Hearts and Hooves Day, so she travels to Celestia for advice, getting a lot more than either of them bargained for in the process.
Many years after the arc of My Little Pony: Friendship is Magic has come to a close, the passing of Twilight’s friends pushes her past the brink of despair.