On the Isaachian frontier, prince Shannan of Isaach has raised a liberation army to fight back against the empire and among its young soldiers was a boy whom the people revered as the "Scion of Light" and the true prince to Grannvale. His name was... Seliph.
Based on the Super Famicom strategy game, Fire Emblem 4: Genealogy of the Holy War. This book exclusively covers the events of the game's 6th chapter.
(Source: MangaDex)