Rain Shine, upon discovering that Autumn Blaze has gone missing, goes out in search of the missing Kirin, only to go missing herself. She then finds herself in an unfamiliar world, in an unfamiliar body, in a city that is visited by adventurers and merchants while being hounded by the forces of darkness. She joins a group of three heroes in their quest to track down the thieves who attacked each of them upon entering Baldur's Gate, recover their stolen possessions, and right the wrongs of the city along the way... all while uncovering a dark plot that's bigger than they could have imagined.
(Baldur's Gate, Dark Alliance/MLP Crossover)
(Part of the Demon War story series, but reading the others isn't required)