I'm pretty sure in my country you can marry only from your 3rd cousin and so on, because at this point you're almost not blood related hence it's barely a incest, but it was ages since I heard that so I might remembering it wrong.
That must be a pretty darn strict country, since it's legal everywhere in America to marry even your straight-up cousins. Some unnamed states even encourage it.
Anyway, I pretty much like it so far. Ema worries me a little. If she was any more drunk in this chapter, she might actually raped Anna and while I'm not 100% against this kind of development (depends how it's done) I really would hate it here. I'm not sure yet who I ship more Anna x Ema or Anna x Miki. Both looks compelling so far, though I guess I like Miki more.
Miku...I don't know what to feel about her quite yet. I don't think she'd treat Anna good one bit...she'd just be a "best friend in crime" type. Ema I think actually fits quite well with her imho. But there's always development to go ofc.
Because Anna is taking pity on Ema after what happened yesterday. Ema was sexually harassing Anna before anyway and was ultra in your crotch with a lot of stuff already so I take it as sign that Anna just gave up.
And keep in mind that certain laws with regards to things like that are there to protect those in danger from predatory older men. Statutory rape and sexual harassment are the main ones. Anna gets squeamish about it, but she doesn't seem to mind it one bit, so while it's technically sexual harassment, Anna doesn't seem to suffer from what that does to girls/women (make them uncomfortable because of the way they're body is put on a sexual pedestal of sorts). I suppose if they do end up having sex in the future, it'd also be technically statutory, but Anna wouldn't go out and complain to the police because there'd be consent and mutually informed feelings involved. The concept of statutory rape as a black/white thing is kinda ridiculous. It's not like a people magically figure out what sex is and have the ability to fend for themselves at a certain age.
Side note, not condoning either of the above when they actually are crimes. Not a rapist, not a pedophile. Do not take away from this that I am saying either, because that couldn't be farther from the truth.