"Fire Emblem: Hasha no Tsurugi" is a manga adaptation of the popular "Fire Emblem" video game series, specifically drawing inspiration from "Fire Emblem: The Binding Blade." The story is set on the continent of Elibe, where the kingdom of Bern, led by the ambitious King Zephiel, seeks to dominate the land. Zephiel's ultimate goal is to resurrect the ancient dragons, believing humanity to be unworthy of ruling the world. This ambition sparks a conflict that threatens the fragile peace among the nations of Elibe.

The protagonist, Roy, is a young nobleman from the Lycian League and the son of Eliwood, a renowned hero. Roy is thrust into leadership when his father falls ill, forcing him to take command of the Lycian army. Despite his inexperience, Roy demonstrates strategic acumen and a strong sense of justice, rallying allies from across Elibe to oppose Bern's tyranny. Among his closest companions are Lilina, the daughter of Hector and heir to the Ostian throne, and Merlinus, a loyal tactician who provides guidance and support.

As the war escalates, Roy and his army face numerous challenges, including battles against Bern's formidable generals and the mysterious forces aligned with Zephiel. The narrative explores themes of leadership, sacrifice, and the moral complexities of war. Roy's journey is marked by personal growth as he grapples with the weight of his responsibilities and the consequences of his decisions. The story also delves into the histories of the continent's nations, revealing ancient conflicts between humans and dragons that continue to shape the present.

The manga adapts key events from the game, including pivotal battles and alliances, while expanding on character interactions and backstories. Notable antagonists include Brunnya, a loyal general of Bern, and Idunn, a tragic figure tied to the dragons' resurrection. The climax centers on Roy's confrontation with Zephiel and the ultimate resolution of the conflict, which hinges on the fate of the dragons and the future of Elibe.

"Fire Emblem: Hasha no Tsurugi" balances action, political intrigue, and character-driven storytelling, offering a faithful yet distinct interpretation of the source material. The narrative emphasizes the interconnectedness of its characters and the broader world, creating a cohesive and engaging tale that appeals to fans of the franchise and newcomers alike.