The novel goes into a bit more detail on how the author tailor fits this world around the MC.
Gatherer tribe exiled by natural disaster to a feudal land where they are put to work hunting Giba to keep their numbers down so they don't devastate the farmlands.
They're only allowed to pick what the Giba eat and trade for the rest. In this novel, they only eat a few plants (and farm crops). On Earth, Boars eat nearly anything they can fit in their mouths.
Giba meat smells because they don't bleed out the animal. I'm pretty sure that's something any hunter/butcher/cook knows except for isekai people.