A boy meets a [[MagicalGirlfriend girl of his dreams]], falls in love with her, is reciprocated, and all seems shiny... until TheReveal that the girl isn't quite compatible with him biologically. For example, she is an [[HumanAlien alien]]. Or a [[CuteGhostGirl ghost]]. Or a [[OurDemonsAreDifferent demon]]. Or a [[BigCreepyCrawlies six-foot praying mantis in a person-suit]]. Or... Either way, she is not human and that's a slight hindrance in their relationship. How exactly it plays out depends largely on the author:

* ThePowerOfLove rules supreme and InterspeciesRomance ensues;
* They are forced to [[StarcrossedLovers part ways despite still loving each other]];
* She offers him to [[ViralTransformation make him just like her]] and he agrees (very common for vampires);
** Occasionally, this is done to save his life via an EmergencyTransformation; the relationship [[ILoveYouVampireSon may]] or [[IHateYouVampireDad may not]] survive this act.
** Alternately, he manages to purify her, assuming her condition is reversible and [[CursedWithAwesome seen as bad]]. A CuteGhostGirl might find [[AnAstralProjectionNotAGhost her body in coma state in hospital]]. God may "punish" an angel by turning her into mundane human.
* One of them just [[{{Wangst}} can't get over it]] and breaks up.

{{Gender Flip}}ped (completely or [[GirlsLove par]][[BoysLove tly]]) variations are also included.

If they stay together, {{Half Human Hybrid}}s may result.

Subtrope of InterspeciesRomance. May be a case of MagicalGirlfriend or even ActionGirlfriend. A common trope in ParanormalRomance but it appears in other genres as well.
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!!Examples:

[[foldercontrol]]

[[folder:Anime and Manga]]
* ''LightNovel/AsobiNiIkuYo'': Boy meets CatGirl Alien, knows a [[HalfHumanHybrid Half Alien]].
* ''LightNovel/{{Baccano}}'': Boy meets [[{{Immortality}} immortal]], [[ObliviousToLove borderline]]-[[{{Asexuality}} asexual]] [[OurHomunculiAreDifferent homunculus]].
* DragonautTheResonance: Boy meets giant, alien dragon.
* Retroactive example: DragonballZ: woman learns her husband is an alien. He didn't know either until his brother showed up.
** Although he was pretty obviously not a ''human'' from the beginning, as he had a tail and turned into a giant ape under the light of the full moon. We just didn't know he was an ''alien.''
* ''LightNovel/DragonCrisis'': Boy meets Dragons and a [[HalfHumanHybrid Half-wolf girl]].
* ''EurekaSeven'': [[spoiler:Eureka is actually a HumanAlien. Renton finds out late in the series, by which point he doesn't care, even after she starts [[ButYourWingsAreBeautiful changing.]]]]
* ''{{FLCL}}'': Boy meets a girl who eventually turns out to be an alien. Alien seduces boy, uses him, then tosses him away.
* ''{{Fractale}}'': Boy meets Doppel and a [[spoiler:clone]].
* ''FruitsBasket'': Girl meets boy(s) who turn to have a secret, magical association with the signs of the Chinese Zodiac, and turn into total animals whenever they're hugged by a member of the opposite sex.
* ''LightNovel/HatarakuMaouSama'': Girl develops crush on [[BlandNameProduct MgRonald's]] coworker. Girl goes out with coworker. Coworker's [[HeIsNotMyBoyfriend alleged ex-girlfriend]] interrupts date and warns girl to stay away from coworker, as he is {{Satan}} incarnate. Girl discovers that alleged ex (really a [[HalfHumanHybrid half-angel hero]]) was being literal.
* ''MahouSenseiNegima'': Boy meets [[UnwantedHarem all]] [[FantasyKitchenSink of the above]].
* ''MermaidMelodyPichiPichiPitch'' has an inversion (mermaid meets boy), [[spoiler:which is later subverted as the boy isn't entirely human either; they are allowed to remain together.]] The other members of the PowerTrio, also mermaids, get human love interests as well; the manga makes it more clear that they'll probably end up StarcrossedLovers because of this, but the anime ends on a happier note. Finally, the series' backstory includes other stories of boy-meets-mermaid played straight; one is a legend with an ambiguous ending, but the other... [[StarcrossedLovers didn't]] [[LoveMakesYouEvil end]] [[RoaringRampageOfRevenge well]].
** ''BlueSubmarineNo6'': Man meets mermaid/catgirl hybrid with similarly ambiguous bittersweet ending.
* ''TasogareOtomeXAmnesia'': Teiichi doesn't realize Yuuko is a ghost when he first meets her.
* ''Anime/TsukuyomiMoonPhase'' Japanese boy meets [[CatGirl nekomimi]]-wearing vampire girl in a German castle.
* From ''VampireKnight'', we have Yuki, a human, falling in love with the vampire Kaname. [[spoiler:But then we find out that Yuki is actually a vampire as well.]] All the students at the Night School are secretly vampires.
* ''YumekuiMerry'': Boy meets Dream Demon.
* ''SpacePirateMito'' relates the story of her own reveal to her beloved Kagero to her HalfHumanHybrid son Aoi and asserts that he is the living embodiment of ThePowerOfLove because Kagero married her anyway. Aoi later gets a reveal of his own when the girl he's fallen for turns out to be a HumanAlien Galactic Patrol officer staking him out to capture his mother.
[[/folder]]

[[folder:Fanworks]]
* Novembersmith's RPS fan-novel FanFic/TheAnatomyOfAFall has boy meets ghost, with a fairly beautiful [[TheReveal reveal]] around the middle of the fic.
* GenderFlipped in 'Shadows Of The Past' as [[spoiler:Will mentions how he showed Sarah what he really was]] when they were dating.
* In MyLittlePonyFriendshipIsMagic tale "Fanfic/FluttershyIsFree", this is what happens to [[spoiler:Fluttershy's mother]], when she wakes up just a bit too soon and discovers she's lain with [[spoiler:a Changeling]].
* GenderFlipped in 'RedLightning' when Double-D is forced to reveal he's a [[DifferentlyPoweredIndividual Super-Psycho]] to Marie after Conner accidently outs him.
[[/folder]]

[[folder:Film]]
* Original ''Film/{{Underworld}}'': Boy meets vampire [[spoiler:and turns into a [[FurAgainstFang werewolf]] himself]].
* The ''Film/TalesFromTheDarksideTheMovie'' movie has a DownerEnding version of this. Guy finds out his wife is a gargoyle, after telling the tale of seeing one once, and promising never to speak of it.
* ''Film/{{Splash}}'': A variation on the classic mermaid-falls-in-love-with-a-human story; she can appear fully human unless she gets wet, which comes as quite a surprise to him the first time it happens.
* ''Film/LetTheRightOneIn''. A dark puppy-love version. A Boy meets a mysterious girl and makes friends with her, only to discover, later, that she's a vampire responsible for a series of local murders. [[spoiler:Also, "she" is actually a castrated boy.]]
* The 2010 remake ''Film/LetMeIn'' has the same. Without the twist of the original.
* ''Film/TheDeathsOfIanStone'' has a peculiar relationship to this trope. In the very beginning, everyone in the setting seems clearly human or clearly inhuman. [[spoiler:The second iteration of the main character's DreamWithinADream reveals that his secondary love interest is both [[EldritchAbomination completely inhuman]] and willing to kill him if he finds out about it. A later iteration reveals that [[TomatoInTheMirror he's inhuman too]], albeit with LaserGuidedAmnesia. Unlike most examples, this isn't about the human primary love interest learning to accept him--rather, he learns to think and feel like a human.]]
* ''Film/GalaxyQuest''. Fred Kwan and Lailari, who he thinks is a HumanAlien. He's quite wrong. [[NightmareFetishist But he doesn't care]].
* ''Film/TheManWhoFellToEarth'' gender flips and deconstructs this with alien Thomas Jerome Newton and his Earthly mistress Mary-Lou. They actually consummate their relationship before he reveals his true, RubberForeheadAlien form to her. Once he does, their already-troubled relationship is only further damaged -- out of his disguise, he's not capable of lovemaking in the human manner, and she finds him physically hideous anyway. [[spoiler: They ultimately fall out of love with each other.]]
* ''Film/TheBermudaDepths'': Magnus and Jennie, servant of a sea demon.
* Played with in ''{{Film/Shrek}}'': Princess Fiona finds out that the knight who saved her, the title character, is an ogre. Fiona is taken aback, but continues to travel with him anyway. One reason is because, before they got to know each other, he was only planning to take her to Lord Farquaad, rather than for himself. The other reason is [[spoiler: the fact that she's cursed to turn into an ogre herself by night.]]
* In ''{{Film/Halloweentown}} III,'' Dylan (a [[HalfHumanHybrid half-human]] [[WitchSpecies warlock]] who DoesNotLikeMagic) gets involved with a girl [[PairTheSmartOnes just as dorky as he is]], only to find out she's a furry pink [[AllTrollsAreDifferent troll]] wearing a costume. He reacts badly, tries to apologize, only for ''her'' to respond that he looks weird and ugly to her too. By the end of the movie they've made up and are about to have their big kiss...but she suddenly backs out of it, he acts relieved, and they agree that they're BetterAsFriends.
[[/folder]]

[[folder:Folklore and Mythology]]
* There's a Japanese myth about [[{{Youkai}} Yuki-Onna]], which plot was used for the ''Film/TalesFromTheDarksideTheMovie'' mentioned above.
* OlderThanPrint: {{Kitsune}} are subject to this trope. ''Kitsune''-wives usually left when their true nature was exposed, but in at least one tale, the husband called after her, reassuring her of welcome, so she returned, but only at night.
* The Selkie myths of Ireland, almost exactly the same as the kitsune-wives, but the men capture the women by hiding the pelts that let them turn back into seals.
* The Huldra women of Norwegian folklore become mortal and gain souls when they are married to a man. However, they still keep their magic and freakish strength, much to the peril of unfaithful husbands.
* Subverted in an Arab folktale. A daughter of a ''ghoul'' (human-eating monster) winds up with some of its magical powers. She nearly gets married to a prince except for the presence of another girl. She throws herself into an oven and reforms, leaving fresh bread ready in the oven to start a welcoming feast for the prince. The other girl claims similar abilities, throws herself into the oven, and burns to death.
* The medieval story of ''Melusine'', which dates back at least to the 12th century, tells of a knight marrying a woman called Melusine:
** One version is she marries him on condition that he never look at her naked. One day his curiosity got the better of him and he peeked while she was taking a bath. To his horror he saw that she had a snake-like tail, showing she was a water-sprite or mermaid. When she realized that her secret was out, she left through the window, never to be seen again. In the most common version of the story, this Melusine is the supposed ancestress of the French Lusignan family.
** Another version had the condition that she be allowed to be alone, locking herself in her room, every Saturday or Sunday till noon, and the knight would never try to look at or visit her then. This was because she was cursed -by her mother!- to turn into a serpent from the waist down during that time, and did not wish him to know. All of her children were born with some slight deformity, but were otherwise brave, good, and fortunate. But the whispers that the children were deformed because they were not his became too much for the knight, and he spied on her. When she found out, she left him, never to be seen again.
* In GreekMythology there were a few examples of this type. For instance, male gods would occasionally reveal who they were on taking leave from the woman they had just impregnated. In a more spectacular example, Hera posed as an old woman to trick Semele, one of her husband Zeus' lovers, into getting him to promise to do her a favour and then make that favour to show himself to her in his true form. She did not survive the experience.
[[/folder]]

[[folder:Literature]]
* ''Literature/{{Twilight}}'': Girl meets vampire.
* MarionZimmerBradley's ''The Wild One'': Boy meets [[spoiler:werelynx]].
* Literature/{{Discworld}}: [[strike:Dwarf-raised human boy]] 2-meter tall dwarf meets werewolf.
* All TheSookieStackhouseMysteries, where girl meets vampire, werewolf, were-tiger, etc.
* LetTheRightOneIn: as with the movie, a young boy meets a strange girl, and an innocent childhood romance develops, before he discovers that she's a bloodthirsty vampire. [[spoiler:The book is even more explicit than the movie about the fact that Eli is a mutilated boy.]]
* ''Literature/BloodAndChocolate'': Boy meets werewolf. One of the more [[SlidingScaleOfIdealismVersusCynicism cynical]] cases, as [[spoiler:not only does their relationship [[StarCrossedLovers not work out]], it's implied that it's [[HumansAreBastards impossible for humans not to hate and fear werewolves]].]]
* ''LightNovel/HaiyoreNyarkoSan'' takes this to a comparative extreme: boy meets [[CthulhuMythos Nyarlathotep]].
* Creator/HarlanEllison has a short story called "She's A Young Thing And Cannot Leave Her Mother" where boy meets [[spoiler:cave-dwelling mutant cannibal descendant of Sawney Beane]] (a.k.a. "Camilla").
* ''TheDoorIntoFire'': Boy meets fire elemental.
* ''The Gravesavers'' by Canadian author Sheree Fitch had a girl meet a boy, who [[spoiler: turned out to be a ghost from the wreck of the RMS Atlantic.]]
* In Philip Josť Farmer's ''Literature/TheLovers'' a man from an oppressive puritan theocracy meets the girl of his dreams in another planet. Except that she's actually a ''lalitha'' [[spoiler: a highly evolved arthropod]].
* In ''Literature/{{Cinder}}'', the cyborg Cinder falls in love with the human Prince Kai, but at the ball is revealed to be a cyborg [[spoiler: and a member of a race of people living on the moon called Lunar.]]
[[/folder]]

[[folder:Live Action TV]]
* ''NightGallery'', a show famous for its twist endings, liked this one.
** "The Phantom Farmhouse": she's [[NinjaPirateZombieRobot a werewolf who's actually a ghost]].
** "Lindemann's Catch": she's a mermaid.
** "The Girl With the Hungry Eyes": she's a psychic vampire.
** "Death on a Barge": she's a regular vampire.
* Isabel in ''{{Roswell}}'' married Jesse Ramirez, who was human, but he didn't find out Isabel was an alien until later in season 3.
* BigWolfOnCampus in the second season has this. Human girl [[BadassNormal Lori Baxter]] dates werewolf Tommy Dawkins. However, towards the end of the season, [[spoiler:they break up because their relationship was getting in the way of their monster fighting.]]
* The main character of ''{{Moonlight}}'' was turned into a vampire by his wife on their wedding night, who forgot to [[IHateYouVampireDad run it by him first]] before doing so.
* ''TrueBlood'' has Tara and Sam, human meets shifter.
* ''Series/BeingHuman'' has werewolf George fall in love with regular human Nina.
** In Season 2, ghost Annie goes on a date with human Saul [[spoiler: Except he's not so normal himself...]], and seemed to have feeling towards normal human Hugh. Also vampire Mitchell is falling for regular human Lucy.
* ''Franchise/StarTrek'' '[[TrekVerse verse]]: Boy meets android, or hologram, or Leanansidhe [-IN SPACE-], or astral projection of someone else's subconscious self, or dead {{Redshirt}} with instincts of aliens who resurrected her, or long dead to ''stay'' and the messages to each other are going through a time warp, or woman whose presence will erase bits of your memory relating to her once she's out of sight... the list goes on. The girls' dating lives are no easier, just not featured quite as often.
* ''Series/BuffyTheVampireSlayer'':
** Subverted with Tara, who ''thinks'' she's a demon and goes to considerable length to prevent Willow from finding out. Turns out she's not; it was just part of her abusive family's "spin to keep the ladies in line".
** Xander has been referred to as a "demon magnet", as a good deal of the girls he falls for turn out to be not so human. In "Teacher's Pet" he has crush on a substitute teacher, who is actually [[spoiler:a giant praying mantis that wants to mate and then eat his head.]] He later falls for "Inca Mummy Girl", and in season seven he goes on a date with a nice girl who [[spoiler:changes her eye colour and offers him as a sacrifice to open the Hellmouth.]]
** Buffy discovers that Angel is a vampire.
** Willow's relationship with Oz is blooming, and then she discovers he is a werewolf. (Though he only found out less than a day before she did.)
** Played with extensively in Season 4: Riley discovers Buffy is the slayer (which means demon infused) as she discovers he is a superagent (which is ultimately revealed to be a little bionic).
* ''Series/{{Charmed}}'': Mid-way through series 1 it's revealed that Piper's (then) boyfriend Leo is not human and that he's a whitelighter. There had been a few [[RunningGag comedic suspicions]] about him prior to the reveal due to Piper's bad luck with men (her boyfriends often ended up being revealed as evil warlocks) but the reveal that he's their guardian angel does come as a shock to all of them. Since whitelighter/witch romances are traditionally forbidden, the couple do spend most of the entire eight seasons struggling to make it work before everything finally works out in the end. Subverted in that whitelighters are actually born human but are transformed into whitelighters and can be turned back into humans if the occasion demands. All three of their children are half-whitelighter, half-witch.
* On TheVampireDiaries, Elena unexpectedly meets Stefan and feels an instant connection with him in season one. However, Stefan is hiding a deep, dark secret: he is a century old vampire. As Stefan and Elena fall harder for each other, Elena eventually discovers that Stefan is a vampire.
* The revival of Series/TheOuterLimits had an episode titled "First Anniversary" in which two aliens stranded on Earth use their power to fool people's senses in order to pass as human. Specifically, as [[UglyGuyHotWife very pretty human women who act romantically interested in some rather plain-looking men]]. Unfortunately, people tend to become resistant to their power after about a year or so, and the men who marry them tend to GoMadFromTheRevelation after seeing their true appearances. (In an aversion of TakeOurWordForIt, when they let down their disguise, it's on-screen - and they really are horrifying.)
* Red's backstory in the first season of OnceUponATime includes this. [[spoiler:Her boyfriend didn't know he was dating a werewolf. Course, Red didn't know that either, and, thinking it's he who is the wolf, ties him up before the change can take him. Then she turns into the wolf and kills him. Oops.]]
[[/folder]]

[[folder:Video Games]]
* There was a subplot in the Game Boy Advance RPG ''VideoGame/{{Robopon}} 2'' based around this. You have to round up a group of alien schoolgirls on a field trip from the moon (ItMakesSenseInContext) and one of them disguises herself as a human and has a guy fall in love with her. You chase them all over the world map. When she finally admits to him that she's an alien, he says that he'll love her no matter what.
* This is one of the possible endings in the InteractiveFiction game ''Afflicted'', where you are a restaurant inspector [[spoiler: who stumbles across a feud between vampires]]. After the player [[spoiler: reassembles Sofia's body, he can agree to be turned into a vampire himself;]] if you simply leave Nikolai's Bar afterwards, [[spoiler: Sofia ends up moving in with you]].
* ''[[VideoGame/FireEmblemElibe Fire Emblem: Blazing Sword]]'': Boy meets [[spoiler:dragon]].
** ''[[VideoGame/FireEmblemTellius Fire Emblem: Path of Radiance]]'': Boy meets cat(girl) in his backstory. [[spoiler:They break up before the game starts.]]
* ''VideoGame/Disgaea2CursedMemories'': Boy meets demon. Turns out to be a non-issue since ''VideoGame/DisgaeaHourOfDarkness'' already showed that human/demon {{Half Human Hybrid}}s are possible (and for those who haven't played it, a character from that game explains it anyhow). [[spoiler:And it doesn't matter anyway, as boy is a demon too but doesn't realize it]]. Of course, by that point, it's stopped being "boy meets demon" and started being "boy meets [[spoiler:reincarnated God Of All Overlords]]."
* ''{{Demonbane}}'': Boy meet MoePersonification of [[TomeOfEldritchLore Necronomicon]].
* Teddie's crush on Labrys in ''{{Persona 4 Arena}}'' inverts this. He meets her thinking she was a normal human girl, feeling ashamed of his own [[PinocchioSyndrome non human nature]] when it is revealed to her soon after. The eventual reveal that she isn't human either, but an amnesiac [[RidiculouslyHumanRobots battle android]] only makes him ''more'' enthusiastic about winning her for himself, if anything.
[[/folder]]

[[folder:Visual Novels]]
* ''FateStayNight'': Boy meets superpowered ghost of [[spoiler:{{Gender Flip}}ped KingArthur]]. Boy meets superpowered magus. Boy meets [[spoiler:corrupted Holy Grail]].
* ''VisualNovel/HatofulBoyfriend'': [[InterspeciesRomance Girl meets bird]]. Wait, that's not this trope... [[spoiler: Nageki's route: Girl meets bird's ''[[GhostAmnesia ghost]]''.]] [[ComicallyMissingThePoint That's more like it!]]
* ''VisualNovel/SayaNoUta'': Boy meets [[spoiler:flesh-eating EldritchAbomination]].
* ''VisualNovel/{{CLANNAD}}'': Girl meets [[spoiler:cat with [[FakeMemories memories]] and [[DeadPersonImpersonation appearance]] of his dead owner.]]
[[/folder]]

[[folder:Webcomics]]
* ''Webcomic/OwMySanity'', explicitly a deconstruction of the MagicalGirlfriend genre, pairs a human with a HumanoidAbomination. The strip is ongoing, but it looks like said human is going to get an UnwantedHarem composed entirely of Lovecraftian monstrosities.
* ''Webcomic/{{xkcd}}'' has [[http://xkcd.com/632/ this comic]], where the reveal shows unexpected dangers of online dating.
* The comic OrangeMarmalade focuses heavily on the main character Ma-ri's dilemma to both keep the fact she is a vampire hidden from her boyfriend but also struggling over whether or not she should tell him she is.[[spoiler: When he eventually discovers the truth from a third party, he is disgusted and horrified to say the least.]]
[[/folder]]

[[folder:Web Original]]
* ''DeptHeavenApocrypha'': Girl meets demon.
* ''KumikoTheDemonGirl'': Boy meets [[HornyDevils Succubus]].
* ''TheMonsterGirlEncyclopedia'': Varies. Several monster girls can disguise themselves really well. Among those, there are some monsters whose will just have fun with male humans, other will seek romantic relationship with their husbands though.
[[/folder]]

[[folder:Western Animation]]
* Parodied by a ShowWithinAShow soap opera in ''JohnnyBravo'', wherein a woman confesses to her lover that she is not what she appears, revealing herself to be a giant dalmatian. In another episode, Johnny goes on a date with a deer. No, not a humanoid deer, part-deer human, anything like that - an actual, albeit talking, deer. In another episode, Johnny goes on a date with a woman who turns out to be a werewolf, and he's actually desperate enough to try to make it work, until he discovers she's hiding an even worse secret.
** One episode plays with this trope, in that Johnny goes out on a date with a vampire woman who the audience knows from the start isn't human, but he remains blissfully unaware until the episode's end. She ends up going back to her old (vampire) boyfriend at that point, and Johnny handles the vampire thing pretty well.
* Done in ''WesternAnimation/ScoobyDooAndTheAlienInvaders'' when Shaggy fell in love with a girl who was heavily into '60s culture. [[spoiler:She turned out to be a GreenSkinnedSpaceBabe in disguise (her clothes and mannerisms having been a result of AliensStealCable), and had to leave Earth at the end of the episode.]]
* ''WesternAnimation/SuperRobotMonkeyTeamHyperforceGo'': Chiro's girlfriend is revealed to be a robot. He doesn't mind, though.
[[/folder]]
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