Veronica, the new girl in town, is lured into the woods by a group of senior boys looking to make her a victim. But the boys don't know that Veronica's been trained to handle herself in surprisingly lethal ways.
SPOILER: Technically the MC got into this situation intentionally to hunt the boys who had been tricking and hunting women, but she is someone who was supposed to be “hunted” who becomes the “hunter” of a group of killers.
Sort of, a bit. Two persons have something like a parent/child relationship, albeit a highly atypical one (one adopts the other as a child, but does so only in order to train her to be an assassin, and we don't really see any normal everyday parent/child interaction), and there's some romantic/sexual tension between them when she's a teenager. She tells someone else that she loves the man romantically; it's never made clear if he feels the same way about her. There's no actual sexual interaction.
Very little, actually, in part because most of the violence takes place in a dark environment. I'm pretty sensitive to gore, and I had absolutely no problem watching this movie.