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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/dpta_blu_ray_japan_cover.jpg]]
%%[[caption-width-right:350:some caption text]]

''Dual! Parallel Trouble Adventure'' (originally called ''Dyuaru! Parare Runrun Monogatari'' in Japan) is a gentle parody of HumongousMecha shows in general and of ''Anime/NeonGenesisEvangelion'' in particular. It was later added as being part of the ''Anime/TenchiMuyo'' OVA continuity.

Kazuki Yotsuga is a high school loner who feels isolated from his classmates because he has disturbingly realistic visions or hallucinations of giant robots battling throughout the city he lives in; it's great stuff to blog about, but ducking from invisible missiles makes people look at him funny. Then one day Mitsuki Sanada, [[TheOjou the most popular girl in school]], drags him home to meet her father, slightly-{{mad scientist}} Ken Sanada. The elder Sanada is a specialist in dimensional physics, and is convinced that when Kazuki has his visions, he is actually seeing events in a parallel world. A lab accident caused by Mitsuki ends up triggering Sanada's experimental dimensional transfer device, and the next thing he knows, Kazuki's not in Kansai any more, Toto...

Stuck in a world where he was never born, where giant robots battle in the streets and turn buildings into very real rubble, and where something called the Rara Army is busy trying to conquer the world one Tokyo neighborhood at a time, Kazuki is lost and confused. But he has an unexpected ability, and when Mitsuki Sanada once again comes to his rescue, this ability gives him a place within the UN forces fighting the invasion of the Rara robots.

Then his life starts getting ''complicated''...
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!!Tropes:

* AllThereInTheManual:
** The defunct [=AIC=] website has more information than what's provided in the show. Also, this [[https://web.archive.org/web/20090209044923/http://www.anime-int.com/works/dual/tv/works.html mecha design]].
** The Tenchi GXP novels mention that Kazuki and the others who go into space are responsible for starting the Great Prehistoric Civilization.
* AlternateSelf: Mitsuki Rara and Mitsuki Sanada are alternate universe versions of one another.
* AlternateTimelineAncestry: In the second world, of the people Kazuki knew are still around, with the exception of himself for an unknown reason. This includes [[spoiler:Mitsuki Sanada, who is instead named "Mitsuki Rara" in this world because in this world, her mother had a child with a different man. Rara's sweet personality is the polar opposite of Sanada's bossy {{Tsundere}} attitude, but the two look almost identical aside from having a different hair color and style. At the end of the series, the two worlds are merged and in the rewritten reality, the two Mitsukis are cousins instead, with their mothers being sisters.]]
%%* ArtifactOfDoom: The source of the HumongousMecha.
* AscendedFanboy: Kazuki. He even [[FallingIntoTheCockpit Falls Into The Cockpit]] of the Core Robot he gave a nickname.
* BettyAndVeronica:
** Yayoi Schwael and Mitsuki Sanada.
** [[spoiler:Mitsuki Rara and Mitsuki Sanada. They're half-sisters as their common mother Ayuko married a different man --- though they were best friends --- in each universe. In the merged universe, she sticks with the father of Mitsuki R. but Akane, the new mother of Mitsuki S. is revealed to actually be the sister of their previous common mother Ayuko, so now the two Mitsukis are cousins instead.]]
* BigBad: The artifact who's command Ayuko Rara follows.
* BookEnds: The main story begins with Mitsuki accidentally triggering the transfer device and ends with Mitsuki accidentally triggering the dimensional merge.
* BridgeBunnies: Commander Sanada has a few working in his command center.
* TheCameo:
** Kiyone Makibi from ''Anime/TenchiUniverse'' appears for a split second in a reaction shot during the final episode. Doubles as a FreezeFrameBonus.
** Amano Misao and Ramia from Pretty Sammy also appear in the same shot.
* CanonWelding: WordOfGod said ''Dual'' was set in TheMultiverse of the ''Anime/TenchiMuyo'' franchise but the ''Anime/TenchiMuyoGXP'' novels later said [[spoiler:humanity of ''Dual'''s Earth colonized the galaxy and seeded the homeworlds of all the HumanAliens in ''TenchiMuyo'' and also a duplicate Earth that Tenchi lives on.]]
* CombatStilettos: Some mechs have feet designed along these lines. The Earth Defense Force units all have them, but the Rara Army tends to use non-humanoid designs.
* ConspicuousTrenchcoat: Mitsuki Sanada and Kazuki wear these to visit Kazuki's house when they return to their home dimension to keep people from recognizing them because Mitsuki's father had come up with a ridiculous cover story for their absence: [[spoiler: He claimed they'd eloped.]]
* CookingDuel: Frequent and informal, between the girls, with Kazuki as the judge. (D can't cook, but she can dump curry sauce on things.)
* CrossOver: ''Anime/TenchiMuyoGXP'' reportedly includes material (read:[[spoiler:Zinv]]) that indicates ''Dual'' is part of the ''Anime/TenchiMuyo'' OVA [[TheVerse 'verse]]. [[spoiler:When Zinv is unrestricted by D he is able to produce Lighthawk Wings. Also Zinv looks just like the robot Seina pilots at the end of ''Tenchi Muyo! GXP''.]]
* DirtyCoward: The UN throws the EDF under the bus and surrenders the world to Rara.
%%* TheDitz: Mitsuki Rara
%%* DuringTheWar: Giant robot war, that is...
* EmbarrassingCoverup: Dr. Sanada's cover story for Mitsuki and Kazuki disappearing into another dimension: [[spoiler:They'd eloped.]]
* EmpathicWeapon: One of the most extreme and strange examples [[spoiler:Zinv not only sympathizes with Kazuki; Zinv ''is'' Kazuki. His parallel twin, anyhow]].
* EnterStageWindow: Yayoi's method of getting to Kazuki in the morning before the other girls. She does not use a ladder or a convenient tree, but a bridge between their houses that she appears to have built overnight after moving in.
* {{Expy}}:
** Kazuki, Mitsuki Sanada and D are pretty much a less mentally screwed up [[Anime/NeonGenesisEvangelion Shinji, Asuka, and Rei]].
** Which also could be said for Ken and Yayoi as less mentally screwed up Gendo and Misato.
%%* FallingIntoTheCockpit: Kazuki, literally.
* FurAndLoathing: The white fox wrap Ayuko Rara wears, and she's of course a vain, materialistic villain.
* GenderRestrictedAbility: The giant robots can only be piloted by girls until Kazuki comes along.
%%* GirlPosse: Mostly nice, for a change.
%%* HighSchool
* HotForStudent: It is pretty clear that Yayoi doesn't even hide her favoritism of Kazuki.
%%* HumongousMecha
* IJustWantMyBelovedToBeHappy: Mitsuki Sanada, since it was her ''conscious choice'' which created the third reality where Kazuki is able to remain with and ultimately end up, not just with her ''but with all of her ostensible rivals.''
* ImportedAlienPhlebotinum: All of the "core robot" technology.
* InconsistentSpelling: [[spoiler:You can see Kazuki's MidseasonUpgrade mech referred to as "ZINV" onscreen, but the main characters call it "Jinbu" (or "Genebu" in the English dub). Likewise, HIMC/"Himiko".]]
* LargeHam: Mitsuki Rara in her "Miss Ra" personality. In the final episode, all the girls get into the act.
%%* LatexSpaceSuit: The pilot suits.
* LeftHanging: A number of whys and hows about the premise. The various Tenchi novels (in Japanese) fill in some of the story ideas that were left hanging by the OVA.
* ManIFeelLikeAWoman: Kazuki and Commander Sanada "testing the shock absorption" of that ridiculous female pilot suit.
* MarryThemAll: At the end of episode 14, both sets of parents (Sanada and Rara) actually encourage him to venture by himself into space as humanity's representative to alien races, ''with all four girls'' ostensibly as his official staff.
* TheMatchmaker:
** Ken seems to go out of his way to cause trouble like this for Kazuki. It begins with him moving Kazuki in with his parallel world daughter Mitsuki Sanada. He then moves CreepyChild D into Kazuki's ''room''. He then moves Mitsuki Rara into the household, ostensibly so that he can eat her cooking without having to line up. And he's likely responsible for Yayoi moving into the house next door -- the passageway between her bedroom and Kazuki's certainly couldn't have been built without his knowledge.
** Yayoi's grandmother Nanjyoin takes great pride in the fact that every couple she set up for an ''[[ArrangedMarriage omiai]]'' has gotten married. She is rather enthusiastic about pairing up all the single women working for the Earth Defense Force. Mitsuki Sanada tries to take advantage of this to get Yayoi away from Kazuki.
* MergedReality: At the end of the series, both dimensions get folded together. Both Mitsukis are included, as are Zinv and Kazuki.
* TheMultiverse: By WordOfGod it is one (or two) of the ''many'' alternative continuities of the ''Anime/TenchiMuyo'' metaseries.
%%* ParentalAbandonment
* PolarOppositeTwins: Despite them being half sisters, Mitsuki Sanada and Mitsuki Rara look like twin sisters but their personalities are night and day.
%%* RainAura
* ReiAyanamiExpy: Played straight with D, who doesn't look like Rei but has a similar personality and role.
%%* ReversePolarity: A variant.
* SaveBothWorlds: [[spoiler:Kazuki thinks he merged the worlds, but Mitsuki Sanada actually did it, even allowing her counterpart to also exist.]]
* ShipperOnDeck: Mitsuki Rara's GirlPosse would be very happy to see her wind up with Kazuki.
* SplitTimelinesPlot: The ColdOpen involves a man named Yotsuga finding some piece of alien technology. His supervisor orders him to throw it into the trash, and immediately the screen splits into two scenes: one of Yotsuga trashing the artifact and another of him keeping it. The story thus deals with the descendant of Yotsuga, Kazuki, living in the world where the artifact was trashed but being able to see visions of the parallel world where it wasn't, where wars are now fought using HumongousMecha.
* SupremeChef: It turns out both Mitsukis have great cooking abilities. So does Yayoi.
* {{Synchronization}}: Pilots are linked to their core robots and show pain when they take damage. Kazuki, in addition to being a male pilot, has ''negative'' "Life Sympathy" that allows him to do crazy things.
* ThroughHisStomach: Everyone who can cook constantly pushes food on Kazuki. As for D, who can't, she adds curry sauce to random dishes.
%%* TwoTeacherSchool
* VillainWorld: While Kazuki was temporarily trapped in his home dimension, Rara forces overran the second dimension and Ayuko became ruler.
%%* WeaponOfMassDestruction
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