Such manga are not uncommon.This manga is proof that if Japan's technology were more advanced than the Europeans during the era of colonization that they'd do the same thing. They're just being modest about it. In this era, I'd be willing to bet that Japan would even dominate the world if they were the global hegemon like the US.
So the mangaka just serve the coping of a national inferiority complex.Such manga are not uncommon.
You can see it in this manga,in "GATE - Jieitai Kanochi nite, Kaku Tatakaeri" even in the "Saving 80000 Gold in Another World for my retirement" ,where the MC who has the power to transfer between our world and one of fantasy who techwise is in the medieval era manages to stop the army of an entire nation that also used dragons as back up, merely with the use of an Earth mercenary corps she hired (and transferred temporarily) and modern weaponry. (later to be repeated when the land she's given as a reward is attacked by foreign nation by sea, using ships and weapons that fit 15th-17th century tech).
It's more or less what happened to Japan in WW2.
They tried to expand and attacked European and U.S colonies/lands, but their technology was vastly inferior for them to be able to manage that and we all know it resulted in a very, VERY humiliating (and costly life wise) defeat for Japan. So in the manga, it's Japan who takes the role not only of the winner but the morally superior force who fights against expansionistic forces/countries who only know how to invade weaker nations.
I don't think it will be an issue later on if the turn coat people want to go back to pre-empire borders. It would be a problem if they can't discreetly send an envoy and negotiate something to them before they reach the old borders thou. There's no stopping the chaos they will bring once they reach the old capital.Uncontrolled uprising might be a problem post war
Something else brought up on another forum, is how the writer of the LN ignores the fact of foreign entities in Japan, primarily US military forces stationed in Japan with all their military equipment.So the mangaka just serve the coping of a national inferiority complex.
It's similar to Korean pornwha where they do dick comparisons with westerners and let the koreans win. Pure cope.
Would get in the way of the nipponese power fantasySomething else brought up on another forum, is how the writer of the LN ignores the fact of foreign entities in Japan, primarily US military forces stationed in Japan with all their military equipment.
Actually they wouldn't do the same thing, they would try to and end up doing something else. Because Japan did take at least one colony, depending on how you might define them, though it was really late compared to the era of colonization. Anyway the history of Taiwan as a Japanese colony can tell you how they would be to their colonies. Sure it wasn't a great era for the people of Taiwan, but it wasn't the same sort of thing as the Europeans were doing with their colonies. The main difference being that while the Europeans were nearly all in on resource extraction, the Japanese tried to build up Taiwan as an extension of Japan, filled with second class citizens. It was similar in ways but still not the same thing.This manga is proof that if Japan's technology were more advanced than the Europeans during the era of colonization that they'd do the same thing. They're just being modest about it. In this era, I'd be willing to bet that Japan would even dominate the world if they were the global hegemon like the US.
European colonization also changed forms many times, to generalize centuries of happenings with multiple empires acting individually is just odd.Actually they wouldn't do the same thing, they would try to and end up doing something else. Because Japan did take at least one colony, depending on how you might define them, though it was really late compared to the era of colonization. Anyway the history of Taiwan as a Japanese colony can tell you how they would be to their colonies. Sure it wasn't a great era for the people of Taiwan, but it wasn't the same sort of thing as the Europeans were doing with their colonies. The main difference being that while the Europeans were nearly all in on resource extraction, the Japanese tried to build up Taiwan as an extension of Japan, filled with second class citizens. It was similar in ways but still not the same thing.
Though what they did in ww2, and the lead up to it, to some areas was closer to what the Europeans did during the era of colonization.