Rokuro and Benio still love each other despite her now being an Impurity, but both hide her transformation from other exorcists out of fear that Benio will be treated as yet another monster and hunted down. Later in the manga, Benio must undergo a ritual that transforms her into an Impurity because the prophesied child must inherit the powers of light from Rokuro and darkness from Benio. The titular couple, Rokuro and Benio, are exorcists who must marry and give birth to a child who is destined to end the war between exorcists and Impurities.

Exorcists are humans who use enchanted powers to exorcise monsters made of corrupt energy known as Impurities.

Twin Star Exorcists has a complicated example.

The Demon Lord Arata's Battle Harem in Trinity Seven has one of its girls become a Hero, a being destined to fight Demon Lords that threaten to destroy the world.

Second, Vega is a Lesbian Vampire who's made her attraction to Elysia rather clear, and Elysia is struggling between her quest for revenge and reciprocating Vega's feelings. Two problems exist: One, Vega is far more powerful than she is.

Natsuneko's Nightmare Syndrome much like Killing Me features a Tsundere Vampire Hunter named Elysia who seeks to slay Vega who slayed her father.

And two, because Saki herself has become Miyoko's favorite target in terms of sucking her blood 'and' pursuing her romantically.

Killing Me! revolves around the story of two classmates, Saki Fujimiya, an honors student, and the ubbly, cheerful Miyoko Kujou, who's playful nature belies the fact that she's a 150-year old vampire.

Monster ( possibly an oni living as a human) get into Oblivious to Love antics with various youkai (who he doesn't so much subdue as just be nice to), while a monster hunter named Oliver rescues an artificial angel who tries unsuccessfully to get him to go along with a Rescue Romance. The titular character is a half demon who attempted to steal the Shikon Jewel but is thwarted by Kikyo, a priestess. Grey-and-Grey Morality may come into play if both sides of the conflict have equally valid and/or invalid arguments.

If Alice was Dating Catwoman, Bob may begin to feel wrong about preying on people no different from his beloved and decide to become Friendly Neighbourhood Vampire or even a Hunter of His Own Kind. If Bob turns out to be a pretty decent guy who acts nothing like what Alice has been lead to believe about vampires, she may come to question the morality of her past vampire slayings. This obviously leads to much drama, as Alice and her friends might have killed Bob's vampire buddies, or vice-versa. This trope tends to play out in one of two ways either the Bob and Alice fall for each other with one or both of them not realizing that Bob is a vampire and Alice is a Vampire Hunter, or Bob and Alice already know they're sworn enemies but are either forced to work together for long enough, or have been fighting each other for so long, that they develop an Inconvenient Attraction.

Monster prom slayer route