Time until Fire Emblem Fates: Birthright release!
Game is already released
Fire Emblem Fates: BirthrightLearn more
Fire Emblem Fates is split into 3 story paths. Birthright is one of the 2 base stories, the other being Conquest. The other story path can be bought digitally at a discount through the in-game store. The 3rd story path is Revelation, a DLC that was released later.
You need to be have completed chapter 6 in either game to access the other stories, and the DLCs, path.
Birthright is the easier path as it has the ability to use scouting missions to grind experience and money, simpler mission objectives, and the missions give greater amounts of experience and money.