As an aside, sub genres would be great. I don't really buy the reasoning some people have that hashtags equals sub-genre. I feel like, either genre needs to be give way to literary, or allow for sub genres. Hashtags are more like specific chapter topics.
But it depends on how much fantasy or science fiction is involved, and in some cases it might be Vampire Science Fantasy. If you remember the Underworld movies, other than the horrendus prequel, those were largely set in the present day with science fiction technology.
Then with some (non-vampire stories) like FF6, you have things like Magitech that makes it that much more confusing.