I haven't finished the final volume yet, so I can only share what I've heard from other readers who've gone through the Japanese releases. From what I understand, the story wraps up in a way that focuses heavily on the political consolidation after all the conflict. Theo and Siluca achieve their central goal of unifying the continent under the single Grancrest banner, bringing an end to the Chaos and the constant warfare between lords. Their partnership, which is the core of the series, is cemented not just in a political alliance but a personal one.
However, the conclusion isn't simply a triumphant coronation scene. I've read discussions suggesting there's a significant time jump near the very end, and the fates of some supporting characters, like the mage Marrine, are addressed in ways that reflect the costs of their long journey. The ending seems to prioritize the establishment of a stable new order over lingering on the battles, showing the results of Theo and Siluca's vision for the world. For me, the appeal was always the tactical maneuvering and the growth of their relationship, so an ending that solidifies that legacy feels fitting, even if some readers might have wanted more detail on certain character resolutions.