I'm not entirely sure as I haven't read it in detail. But generally, it might be about a house in a borderland area and the strange events or characters associated with it.
Since I haven't read 'the house on the borderland graphic novel', I can't say for sure who the main characters are. However, they could be people who have some connection to the borderland or the house. Maybe an explorer, a local resident, or someone who has a special mission related to the place.
However, across the other novels in the collection, there are a variety of characters. Some are adventurers, like those in certain stories who are exploring uncharted territories. They are often brave but also vulnerable to the strange and dangerous things they encounter.
The use of vivid and detailed descriptions is also a key aspect. The author manages to paint pictures in the reader's mind, whether it's the desolate landscapes or the terrifying creatures that inhabit the fictional worlds. This makes the novels very immersive.
Overall, Alice in Borderland is reasonably faithful to the manga. Some minor details might differ for the sake of the adaptation, but the core story remains intact. There are no major deviations that would change the essence of the original manga.