One of the central plot threads involves a series of ritual murders, described in some detail. Each one appears to begin as consensual bondage sex and clearly becomes physically violent while the women are restrained. It is unclear whether anything overtly sexual occurs after the violence begins. Additionally, the male love interest repeatedly pushes the female lead's boundaries (non-sexually mostly but not always). Not quite to the point of harassment, and she does reciprocate his feelings, but the dynamic may be uncomfortable for some.