Set in the land of Fodlan, an alternate retelling of events from Fire Emblem: Three Houses. The story follows Shez, a young mercenary whose company is wiped out in a devastating ambush by a rival sword for hire known as the Ashen Demon, Byleth. Surviving only through the intervention of Arval, a mysterious presence that dwells within their mind, Shez swears revenge. Months later, chance brings Shez to the rescue of three young nobles beset by bandits: Edelgard, heir to the Adrestian Empire; Dimitri, prince of the Holy Kingdom of Faerghus; and Claude, heir to the Leicester Alliance. In gratitude, Shez is enrolled at the Officers Academy of Garreg Mach Monastery, where the three future rulers study side by side. But peace is fragile, and as crises erupt across the divided continent, Shez must choose which of the three nations to serve, setting Fodlan on the path to a sweeping war fought across three very different destinies.