[@Hayazo]: Well, that was fast. Let me see here...

Well, like I said to jiwon before, the problem that I see here is an overloaded set of abilities. Farming, hand-to-hand combat experience, magic in the form of foxfire, water walking, a physical body strength buff, and the know-how to ferment sake... Rolling all that into one package is still kinda... Yeah. It's a lot. Water walking and foxfire... Those two things are probably my biggest worries, since... Well, water walking is pretty bs and a small fire when we already have multiple people who can and need to use it (the elf and the alchemist) is kind of... Well, adding it on for the sake of it. The body strengthening makes sense if she's a farmer, in a way, and I have no problems with a somewhat-capable beans of self-defense, but those two are... No go for me.

Next... 

"Deaths in such duels are very rare, and the kitsune have a very strong sense of honor, so the terms of the duels are usually upheld."
and
"So, at the first opening, Yukine snapped the man's neck. She was pretty upset about having killed another person, but Ayato consoled her, and it wasn't the last time she killed to defend her home."
combined with her personality seems... Off. Maybe it's just the short period of time that was covered, but I also think that not becoming jaded to killing others (as a farmer and starting at age 14, no less!) is kind of... Yeah. I would think that with the culture you've laid out for the nation and the emphasis you've put on duels here, death by combat would be a far less common occurrence than the profile implies.

Just my two cents for now. Discussion is fine.