@Twi
Having "common sense" does not equate to being completely used to the culture. She might
know everything a native would, but she wouldn't
act like a native. She
does act like a native, though. I
know how to act in certain high-pressure situations, but I've never actually
done it. So I would probably mess some minor detail up.
She doesn't mess up.
The way she described "Otherworldy Sense", so far, it only grants common knowledge. Not habit or familiarity, only
knowledge. She acts way too natural for someone only having
knowledge. The way she handled the guard, for instance. Unless she'd already been in a similar situation, she would likely be more nervous. I can't figure out any way she might have experienced that in
our world, unless she hung out with unsavory types. And it's one thing to
know the bread isn't good, it's another entirely to
not even react in the slightest the first time she
actually tasted it.
Then there's her skills. Another commenter (on ch 2 I think?) calculated the likely cost of her skills, using the costs we learned. Using the
minimum known costs, her skills are
still worth more than the points she claimed she got. They used novel info, but as far as I could tell her skills are the same in the manga.