Well, without having read 'nito no taidana isekai shoukougun novel', it's hard to say precisely. However, if we break down the words, 'isekai' means different world. So perhaps it tells a story of a person or entity in this 'nito no taidana' situation who ends up in a different world and has a journey related to'shoukougun', which might imply some kind of leadership or military aspect in that new world.
You could try looking for it in local bookstores that specialize in Japanese novels or those with a large selection of isekai - genre books. Sometimes they have imported titles.
I'm not entirely sure as I haven't read this web novel specifically. But generally, 'isekai' often involves a character being transported to another world. Maybe this one is about a character who finds it not difficult ('bunan') to live in the other world ('isekai') and there are some elements related to a certain military or strategic situation ('shoukougun') in the story.
The title 'isekai demo bunan ni ikitai shoukougun novel' gives some hints. 'Isekai' means another world. It might be that the story focuses on the ease or difficulty of living in this other world, perhaps with a military - like theme as'shoukougun' could imply something related to military. The novel might explore how the characters adapt to this new environment, whether they face challenges related to resources, relationships with the native inhabitants, or their own moral and ethical dilemmas in this new world.
Sorry, I don't have much detailed information on it. But it seems to be an isekai - themed novel. It may tell a story about a character's experience in another world.
Since I don't know the exact nature of 'isekai demo bunan ni ikitai shoukougun web novel' in great detail, it's a bit tough to recommend exact similar ones. However, 'Sword Art Online' has some isekai - like elements where the characters are in a virtual world that has its own rules and challenges. Also, 'That Time I Got Reincarnated as a Slime' is an isekai where the protagonist has to figure out how to survive and thrive in a new world, which could potentially be related to the concept in the given web novel.
For me, 'That Time I Got Reincarnated as a Slime' stands out. The world-building and plot development are really engaging. Also, the characters have a lot of depth.
Well, it's a bit hard to pinpoint exactly which was the very first one. But some early examples could include 'El-Hazard: The Magnificent World', which had elements of the isekai genre.
Isekai Quartet indeed has a manga. It offers a different perspective and sometimes delves deeper into the story compared to the anime. The manga can be a great companion to the animated version for fans wanting more of the Isekai Quartet world.
I'd recommend checking out online manga libraries such as Comixology or Crunchyroll Manga. They often have a good selection of isekai titles. Also, some local libraries might have physical or digital copies you can access.