Fics like Once in a Lifetime

And you may find yourself in a beautiful house, with a beautiful wife, and you may ask yourself, "Well, how did I get here?" Byleth Eisner—the Ruler of Dawn, Guardian of Order, Wings of the Hegemon—awakens in a world familiar yet unknown as empress consort of a Fódlan unified under the banner of the Adrestian Empire with no memory of how this all came to be. Amnesia proves not to be her only dilemma, however, as she soon finds her mind torn between other worlds where dead men walk and different monarchs stand at the head of the continent, herself being one of them. Now, Byleth and her allies across time and space must endeavor to unravel the mystery behind her interdimensional quandary all the while dealing with the circumstances that plague them, and as she struggles to play the roles of the great women whose lives she has commandeered, she may come to truly know each and every facet of Byleth Eisner.

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