I'm not sure specifically as I haven't read it. But generally, in the context of 'isekai' (another world) type novels, it might be about a hero who returns from another world and becomes the strongest in the modern world.
Well, from what the title 'dungeon kurashi no moto yuusha light novel' suggests, it could be centered around a hero (yuusha) who has his origin (moto) related to dungeon life (dungeon kurashi). It might tell the story of how this hero came to be in the dungeon, what kind of challenges he had to overcome at the very start, and how his character developed over time. It could also include the unique ecosystem or rules within the dungeon that the hero has to adapt to.
If you're into Japanese media, there are often specialized anime and manga stores that also stock light novels. They might be able to order it for you if they don't have it in stock. Another option is to check out some fan - based communities or forums related to light novels. People there might be able to give you more specific information on where to find this particular light novel, like some small independent bookshops that they know carry it.
The 'isekai kara kita yuusha novel' likely tells a story full of fantasy elements. The hero coming from another world is a common trope in isekai stories. He could be summoned there by some magic or accident. Once in this new world, he may have to adapt to different cultures, magic systems, and races. His experiences would form the core of the story, which might include battles against powerful foes, exploring unknown lands, and uncovering the secrets of this new world.
Since I don't know the exact novel, I can't say for sure. But usually, there would be the hero who comes from another world. There might also be characters who help or oppose the hero in the new world.
I'm not sure specifically as I haven't read this novel. It might be about a young hero ('shounen yuusha') who is involved in another world ('isekai') in some way related to 'gyuujiru' which might be a special action or concept within the story.
I'm not sure exactly as I haven't read this light novel. But generally, 'isekai' often involves a character being transported to another world. Maybe the'shounin yuusha' (young merchant hero) has some sort of adventure or growth while making their way in this new world of 'isekai' that the novel is set in.
Since I haven't read this light novel specifically, it's hard to give a detailed account. However, based on the words, it seems that the story might revolve around a male protagonist (shounen yuusha). The 'isekai wo gyuujiru' part could suggest that he has some sort of extraordinary ability or mission related to the other world (isekai). Maybe he's on a journey to conquer or understand this new world, which is a common theme in light novels.