Hundreds of years ago, before the kingdoms even existed, three wanderers met each other, and together decided to go to a new world. Each has their own past, and together they must find a way to cope with it as they're traveling to a place where they can finally live in peace.
Linhardt is a memory witch — he extracts people's memories and freezes them in Crest necklaces to be revisited whenever by those who needs it. He has no memories of his life, however, no sense of time or space but the present. Byleth stumbles into his store one day, and Linhardt starts to remember.
Dimitri is cursed to become Dracula, the lord of vampires, one day--but he doesn't know it until Claude von Riegan walks into his life and upends everything he's ever believed. They try to break the curse together, but they fail, dooming Dimitri to damnation. Five years later, armed with new knowledge, skills, and a risky scheme, Claude returns to the castle determined to save the man he loves.
After realising he is being treated no better than how he was as a servant of Goneril, Cyril begins to resent the Lady Rhea. Luckily for him, a certain leader of the Black Eagles shares that sentiment, and Cyril and Edelgard join causes to bring Rhea down. They enlist the help of a few likeminded individuals, Lysithea and Shamir among them, and fight in the war to achieve the archbishop's end.