Last Battalion Online is an online strategy simulation game in which players create a nation and aim for world domination. The main character, who was playing the game, wakes up to find that he has become “Eryutheia” his own character in the game, and is leading the “Yamato Empire” a modern nation he created. (S)He is also discovered that his (her) entire country has suddenly been transferred to another world. A barbaric and dangerous alien race is discovered. The protagonist, leading a nation that has been transferred to a fantasy world, reluctantly walks the path to world domination.