"Last Battalion Online" is an online strategy simulation game where players build nations and aim for world domination.

The protagonist, who was playing this game, woke up to find himself as his in-game character, "Erytheia," leading the modern nation he created, the "Yamato Empire."

Furthermore, he is suddenly informed of a nation-by-nation transfer to another world. Barbaric and vicious alien races are discovered. Leading his nation, which has been transferred to a fantasy world, the protagonist reluctantly embarks on the path to world domination.

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