After you beat the 28th stage in Jeanne d’Arc, there will be a branching path as you can pick between Alrond Wood and Gywgone Mines.
Path A: Arlon Woods
If you decide to go to Alrond Wood, then you will see more of the relationship between Beatrix and Bartolomeo, in addition to learning about the Elves.
The two stages are also considered easier and quicker in this path.
Path B: Gywgone Mines
If you decide to go to Gywgone Mines, then you will learn more about Bertrand and the Dwarfs.
The two stages on this path are considerably tougher. Not to mention the second stage can be extremely long if you don’t have magic that can attack the boss between walls in the beginning.
If you are curious, you can find a video showing all the gameplay and scenes for both paths below: