For romances that not only involve the use of fantastic plot elements, but are literally impossible to pull off unless one or both parties are chronically defying the laws of physics, traveling through time, reality warping, dimension hopping, or defying culturally accepted norms and standards regarding the mingling of fantastic, non-fantastic, or other fantastic races.

If a character is TrappedInAnotherWorld and then gets embroiled in such a romance, they often end up saying IChooseToStay. If they are forced apart, or [[ButNowIMustGo decide to return to their own worlds]], then they are StarCrossedLovers. They may still get a DoppelgangerReplacementLoveInterest back at home. Such relationships often result in the creation of a HalfHumanHybrid.

Compare MagicalGirlfriend, MagicContractRomance, and InterspeciesRomance.
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!!Examples:

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[[folder: Anime and Manga ]]

* ''VisionOfEscaflowne''.
* In ''FushigiYuugi'', Miaka and Tamahome.
* ''EurekaSeven'' has this as the driving force between the two leads.
* ''Manga/InuYasha'': The main story is set 500 years in the past, which is the time period Inuyasha belongs to. Kagome, however, is a girl of the modern age who accidentally finds a way to travel back in time to Inuyasha's period. Without that time travelling, they'd never have met. This is made even more complicated by the fact that the reason Kagome can time travel is due to the desires of the woman she is an incarnation of: Kikyou, who died 50 years before the main story's setting, was Inuyasha's first love and guardian to the DismantledMacGuffin. Without her duty to the jewel and her desire to see Inuyasha one last time as she died, Kagome would never have been able to travel through time nor would she have inherited guardianship of the jewel that brings her and Inuyasha together.
** Kikyou's "desire to see inuyasha" seems more like a shoddy retconn on Rumiko Takakhashi's part rather than an actual desire on the part of the character, considering her last wish was to take the jewel from Inuyasha's "evil" hands and she specifically wished to never see him again. And went straight to killing him for a long time after her resurrection.Add to that the generally cold way she treats him after being brought back, not lifting a finger to protect him and even putting his life in danger several times, her "wish" is obviously complete and utter rubbish designed to create more sympathy for her. Seems more like a retconn on Takahashi's part to credit Kagome's love to Kikyou. Either way it was the wish of the jewel not Kikyou that brought Kagome back in time and Kagome herself states her heart is her own. Inuyasha also states that he was born for Kagome and his feelings for her have nothing to do with Kikyou.
* In ''RahXephon'', [[spoiler:one of these drives the entire plot.]]
** To explain further (massive spoilers ahead): [[spoiler:Ayato and Haruka were middle-school sweethearts, but the impenetrable Tokyo Jupiter field went up while she was on vacation, trapping him inside and her out when they're fourteen. Thanks to the field's time-dilation effects, three years pass for him and fifteen for her. Thus, Haruka is twelve years older than him when she manages to rescue him from Tokyo. Furthermore, he has lost all memory of her (and technically isn't even human anymore). She, however, has spent the whole time pining for him. Eventually, he once again falls in love with her, and that love drives him to use his HumongousMecha's full potential and become a god. In the end, he recreates the world so that the two of them can be together.]]
** The fact that it is heavily influenced by the short story ''TheDandelionGirl'' helps explain a lot.
* In ''Anime/VoicesOfADistantStar'', the teenaged romantic leads are separated by FasterThanLightTravel without any corresponding method of faster-than-light communication, so that by the end, the 15-year-old girl's text messages aren't received by her boyfriend until he's 24 and beginning to move on. [[TearJerker It is every bit as heartbreaking as it sounds.]]
* ''VisualNovel/YamiToBoushiToHonNoTabibito'': When your girlfriend is the ''axis mundi'' and you're a normal schoolgirl ([[BadassNormal for a given value of normal]]), romance is literally impossible to maintain. It's possible to meet her again, just... not in the capacity of lovers.
* ''Manga/KannazukiNoMiko'': When destiny says that you [[spoiler:have to kill your girlfriend to complete a world-maintaining ritual]], it's impossible to maintain a semblance of normal romance. [[EternalRecurrence And you have to repeat it again and again.]]
* ''Anime/PuellaMagiMadokaMagica'': Congratulations, [[spoiler:your girlfriend has broken the ViciousCycle [[GroundhogDayLoop that killed her repeatedly]], but now she no longer exists in the space-time continuum! [[YouAreNotAlone You can still hear her voice, though.]]]]
* ''VisualNovel/SteinsGate'' requires a ''very'' elaborate StableTimeLoop for Okabe to meet Kurisu, fall in love and [[spoiler:save her from the murder that sparked the whole thing while avoiding a major time paradox]].

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[[folder: Comics ]]

* In ''{{Headstatic}}'', there's a couple who have a ReincarnationRomance like this, who always find each other in every life they live.
* Plenty of this in ''MarvelComics'', what with all the [[AnotherDimension other dimensions]], [[TheMultiverse alternate realities]] and TimeTravel that goes on.
** Since [[AllMythsAreTrue the mythological gods are real]], this can happen. An early example being [[Comicbook/TheMightyThor Thor]] and [[MayflyDecemberRomance Jane Foster]].
** Comicbook/DoctorStrange and Clea, a beautiful damsel (and later ActionGirl) from the Dark Dimension.
** The insanely convoluted courtship, marriage and breakup of [[Comicbook/XMen Scott Summers and Jean Grey]]. The [[KidFromTheFuture situation with their children]] only makes things worse.
** [[Comicbook/{{Dazzler}} Allison Blaire]], a human mutant from Earth and [[ArtificialHuman Longshot]], who is from the [[RefugeeFromTVLand Mojoverse]]. This is mirrored by Rictor, also a human mutant, and Shatterstar, who is from the ''future'' of the Mojoverse.

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[[folder: Fanfic ]]

* In {{Fanfic/Uplifted}} the romance between Hanala'Jarva vas Devoas and SS Officer Joachim Hoch. As well as Tali Zorah and Commander Shepard.
* Fairly common within the 'Human-in-Equestra' genre with WesternAnimation/MyLittlePonyFriendshipIsMagic fan fiction.
** ''FanFic/{{Xenophilia}}'' involves one between Lero, a human, and Rainbow Dash after he magically ends up in Equestria.
** ''FanFic/SophisticationAndBetrayal'' involves one between the human protagonist and Rarity after an accident sends him to Equestria.
* In ''[[Fanfic/GhostghostIknowyoulivewithinme Ghost, Ghost, I Know You Live Within Me]]'', Shepard and Garrus fell in love and got together after she died on Alchera and came back as a ghost.

[[/folder]]

[[folder: Film ]]

* ''Film/{{Avatar}}''
* A lot in ''Franchise/PiratesOfTheCaribbean'':
** Davy Jones and the goddess Calypso in the second and the third movie.
** Will after removing his heart and becoming the captain of the Flying Dutchman and Elizabeth at the end of the third movie.
** Philip and Syrena in the fourth.
* ''Film/SomewhereInTime'' (time travel)
* ''Film/KateAndLeopold'' (time travel)
* ''Film/TimeriderTheAdventureOfLyleSwann''. A man is accidentally sent back in time and falls in love with a woman: he ends up becoming his own great grandfather.
* ''TheLakeHouse''.
* ''Film/{{Enchanted}}''.
* ''Film/TheTerminator'', where Kyle Reese is sent back in time to protect the mother of future human resistance leader John Connor [[spoiler: and [[StableTimeLoop ends up fathering him]] as well.]]
* ''Film/{{Stardust}}''
* ''Disney/ThePrincessAndTheFrog'', wherein both romantic leads spend the majority of the courtship [[spoiler:and marry]] as [[BalefulPolymorph magically transformed frogs]].
* Doc and Clara in ''Film/BackToTheFuture III''.
* The title character in ''[[Film/DonJuanDemarco Don Juan DeMarco]]'' tells several fantastic tales, all involving gorgeous women, set among beautiful scenery.

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[[folder: Literature ]]

* ''Literature/TheTimeTravelersWife''.
* In ''Literature/SlaughterhouseFive'', Billy Pilgrim engages in such a relationship with Montana Wildhack in a Tralfamadoran zoo. His marriage back on planet Earth is similar, but one-sided. His proper wife just thinks he's gone nuts. [[AlternateCharacterInterpretation And maybe he did]].
* ''Literature/HisDarkMaterials'', where Lyra and Will come from different universes. [[spoiler:They don't get the option of staying with each other however, and have to return to their respective worlds at the end of the story.]]
* ''Literature/{{Twilight}}'': [[OurVampiresAreDifferent Edward]] should have died in the flu epidemic, about 100 years ago.
* ''Literature/TimeAndAgain'': time travel
* ''Literature/TheDandelionGirl'': "Day before yesterday I saw a rabbit, and yesterday a deer, and today, you."
* In ''Literature/WarriorCats'', Jayfeather ends up going back in time - to the ancestors of the forest Clans before they even ''lived'' in the forest - and falls in love with Half Moon. He is able to go back to her time again later [[IChooseToStay and wants to stay]], but their destinies [[StarCrossedLovers don't allow it]].

[[/folder]]

[[folder: Live Action TV ]]

* The "Time in a Bottle" story arc on ''Series/PortCharles.''
* "The Girl in the Fireplace" of ''Series/DoctorWho''. Also ''The Aztecs'', and any of the common Classic episodes where the companion stays in the time period because they met someone.
** The aptly named series 2 episode "Love And Monsters": a perfectly normal man has a relationship with [[spoiler: a woman's face set in a slab of cement.]] ItMakesSenseInContext.
* Captain Jack Harkness and [[spoiler: Captain Jack Harkness, who the first Jack stole the identity from in 1940s Britain when he died]] in the ''Series/{{Torchwood}}'' episode "Captain Jack Harkness".
* ''Series/LostInAusten''.
* ''Series/PhilOfTheFuture'', though [[LastMinuteHookup not till the end]].
* ''Series/PushingDaisies'': Chuck should be dead.
* ''{{Primeval}}'' has Matt and Emily, both of whom are from different time periods than the show's main one. Matt is from the future, Emily is from the past. They turn into StarCrossedLovers when Emily goes back into her own time. [[spoiler: But she's back as of 5x03.]]
* ''Series/TheSarahConnorChronicles'' has the {{UST}}-laden quasi-romance between John and [[RobotGirl Cameron]].
* ''Series/WizardsOfWaverlyPlace'': In every way imaginable...

[[/folder]]

[[folder: Video Game ]]

* ''VisualNovel/SayaNoUta'': The main heroine, Saya is not a human. And you'll realize how impossible it is for the protagonist to love her under normal circumstances.
* In ''VideoGame/MitsumeteKnight'', the Asian (the main male protagonist) can have such romances with [[spoiler: Anne, a CuteGhostGirl with a tangible body]], and [[spoiler: his FairyCompanion Piko, a being emanating from his heart]]. Both relationships end up [[spoiler: with a ButNowIMustGo from the girl]].
* In ''VisualNovel/HatofulBoyfriend'', even disregarding the whole [[InterspeciesRomance pigeon thing]], the heroine's relationship with [[spoiler: Fujishiro Nageki]] ends with the revelation that [[spoiler: he committed suicide five years ago, and [[ButNowIMustGo his time as a ghost has come to an end]]]].

[[/folder]]

[[folder: Webcomics ]]

* In ''Webcomic/SluggyFreelance'' Torg and Alt-Zoe, as well as Torg and Valerie fit this role, the former being from different dimensions, and the latter from different eras in history.
* [[http://dreamless.keenspot.com/d/20090105.html Dreamless]]
* ''Webcomic/{{Freefall}}'': Florence, a [[PettingZooPeople Bowman's Wolf]], is technically an AI, while Winston is a genetically-modified human. They aren't supposed to feel attraction for each other.
* ''Webcomic/YuMeDream'' [[spoiler:ends up being this, with the revelation that Part I was all part of Fiona's coma dream, meaning that Lia, not to mention her other friends, don't exist in reality, and [[BigBad Sadako]] locking her out of the dreamworld. Part II sees her find a way back into the dream world to find Lia.]]
* ''Webcomic/{{Homestuck}}'' has a few, but probably the most fantastic and romantic of them all is [[spoiler:John/Vriska. They are different species and from different universes, she can communicate with him at any point in his timeline, and they first interact when she tries to mentor him to become stronger so they can defeat the game on whom the fate of the world depends which they are all playing. When they finally meet, it is after Vriska has died and they're only communicating through a dream bubble... or, rather, Vriska is talking to an alternate timeline version of John who never met her.]]
* ''Webcomic/SlightlyDamned'' hits this one straight on, with the main pairing being the child-like Fire Demon [[ThePollyanna Buwaro]] and the [[ShrinkingViolet shy and introverted]] Water Angel Kieri.

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