Star Wars Jedi: Fallen Order plays about five years after the movie Star Wars: Episode 3 - The Revenge of the Sith. You take on the role of a fugitive Jedi named Cal, who escaped the purge by Darth Vader and the Empire.
Cal and his mentor Ceres somehow try to remain undiscovered. During their journey they meet other characters, including the 9th Sister and 2nd Sister. However, the person also declared that he didn't remember everything. So the names might not be right either.