As incentive, players can unlock items in the prologue that will carry over into the main Dissidia 012 game. Plus, simply purchasing the prologue unlocks Aerith from Final Fantasy VII as an Assist ...

In a way, Final Fantasy 7 Rebirth still tells the original game's story, but it alters a few key moments significantly, and that is not more clearly seen than in the way it handles Aerith's arc.