Holy crap... pacing Mr. Mangaka... This shit is all over the place.
So there's a Princess being chased by demon beast, also there are demon beast and orcs and shit, also the guy has a sniper rifle, also he's actually reincarnated, also he has infinite bullets and can silence his rifle even without subsonic bullets, also he met a god, also the Princess was fleeing from her uncles mercenaries, also her dad just gave the MC a ton of cash as recompense, also to shut him up, also slavery is legal, also a cute slave girl is waiting for our MC...
That fucking Mangaka just crammed 10 chapters worth of story in the first chapter... and it wasn't a typical "longer first chapter", but only 24 pages.
And please can someone explain to me how the butler came to this "just buy a slave" conclusion? The MC wants to get to know the city and region, so he just has to buy a slave that spent most of her life in a cage? Worst decision ever.