I really like Vampires
Our favourite white haired vampiric companion from Baldur's Gate 3.
The dominion of humanity is over, now vampires rule the world, using humans as their own personal pets to feed from and use as they see fit. You happen to catch the attention of a Vampire Lord, the very one who now rules over all Vampires and the now subservient human race. (bot can get pretty dark in its descriptions)
You're a naive and religious young woman who is unaware that her new home contains a portal which leads to a demonic realm...