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14-Aug-2023 — ベルジェ伯爵との戦争は、リオンクール家の家督争いも併発した！バリアンの知らないところで着々と進む計画。戦争中に蠢く内憂は、バリアン、そしてリオンクール家をどこへ連れて行くのか！？あまりに過酷で過激な異世界戦記、ついに完結！ アニメイトタイムズ

The between the web novel and the manga adaptation.

As the second son, Barrian often finds himself at the center of these political machinations, even as he strives to improve the living standards and military strength of his territory.

You can find the official chapters and volumes through these platforms:

The completed source material (under its original title Tanaka Tadashi (41) Record of a Nation's Founding ) is available on Shousetsuka ni Narou . If you'd like, I can help you with: Detailed character summaries for the Lioncourt family.