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''Blue Drop'' is a series of {{manga}} stories by Akihito Yoshitomi in which [[VichyEarth Earth has been conquered by the Arume]], an alien race which is very much [[HumanAliens human in appearance]], but [[OneGenderRace consists only of females]]. Consequently, they are by and large homosexual and are attracted to earth women, which leads to a lot of depictions of lesbian sexual behavior. An anime series by Creator/AsahiProduction and {{Creator/Gonzo}}[[note]]The latter only doing CGI[[/note]] was released in 2007 that takes place one thousand years before the manga and describes the events leading up to the Arume invasion. The anime's emphasis is more on character development, whereas the manga tends to be more explicit and often crosses the line towards {{Hentai}} (although it's generally more [[FanDisservice creepy than erotic]]).

The manga consists mainly of one-shot stories, presented in two series, describing the struggles of human society with the Arume in charge. The main recurring character in the first series is Yui, who is a human/alien hybrid and a member of the earth resistance. An important theme is the Arume's use of children to fight the semi-sentient remnants of their biological weaponry in the earth's seas. The second series, ''Blue Drop - Tenshi no Bokura'' (Angel's Men), adds some [[GenderBender gender-bending]] to the mix and often contains very graphic (and very horrifying) sexual scenes and themes. ''Blue Drop's'' third manga is a short, romantic story called ''Maiorita Tenshi'' which chronologically is set between the anime and ''Tenshi no Bokura''. Lastly there is the manga ''Tenshi no Itazura'' (Angel's Prank), the shortest ''Blue Drop'' work being only three chapters in length.

The anime series is called ''Blue Drop - Tenshitachi no Gikyoku'' (Angels' Play) and describes the antics of Hagino and Mari. Hagino is the commander of an Arume battleship; Mari is the sole survivor of a disaster caused by that ship five years earlier. The story focuses on the gradually intensifying relationship between the two girls, set against the threat of the Arume invasion and Hagino's rising doubts about its purpose.

The subbed version of the {{anime}} currently has a [[http://www.theanimenetwork.com/Anime/Blue-Drop/Info free legal stream]] on the Creator/AnimeNetwork, although restricted to certain countries.

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!!Tropes:
%%* AlienInvasion
* AnimalMotifs: There are terns appearing throughout the anime, including in the dorm's stained glass windows. And then there's [[SpaceWhale Hagino's spaceship]].
%%* AppliedPhlebotinum: the Emul Force and the "thought-arresting weapons" that it powers.
* ArtificialHuman: The Arume create synthetic children as living bombs.
* BlueAndOrangeMorality: The Arume aren't completely out there, but their sense of morality definitely doesn't jive with humanity's. Specifically, using ChildSoldiers (Volunteer, or so they claim) for [[SuicideAttack suicide bombing]] because it's "beautiful" and being grossed out by males.
* BookEnds: The anime starts and ends with [[spoiler:Michiko in a shuttle on her way to a peace talk with the Arume]].
%%* BridgeBunnies: Tsubael
* BuryYourGays: [[spoiler:Hagino dies, right after she and Mari confess to each other. Who would have seen ''that'' coming?]]%%move to OutOfTheClosetAndIntoTheLineOfFire when it launches
%%ZCE** In ''Maiorita Tenshi'', [[spoiler:this trope gets [[SubvertedTrope subverted]] by Ai in the last chapter.]]
%%* CannotSpitItOut: Hagino, repeatedly.
* CastFullOfGay: A ''vast'' majority of the entire cast, in both the Anime and Manga series, are lesbians.
%%* CensorSteam: Used in the anime during a kiss.
%%* ChivalrousPervert: Yui
* CoolButInefficient: Tsubael uses a robotic bird to commmunicate with Hagino. Cell phones, anyone?
* CrapsackWorld: If you're a MagicalGirl, you're a bomb disposal unit. If you're a schoolgirl, you're little more than a sex slave. If you're a guy, you're used as a lab-rat for transgender experiments ''if you're lucky''.
%%* CreditsRunningSequence
%%* DatingCatwoman: In the manga, Yui the Half-Arume rebel and Misato the Arume scientist.
%%* DefrostingIceQueen: Hagino shows a mild variety of this.
%%* DiscountLesbians: The Arume and their half-human offspring.
%%* DisturbedDoves: Actually, lots of seabirds.
%%* DramaticWind
%%* ElaborateUniversityHigh
%%* EvenTheGirlsWantHer: Hagino, and, in her {{Bifauxnen}} role in the play, Akane.
* EvilVersusEvil: In ''Tenshi no Bokura''. The Arume (simply batshit insane) versus [[spoiler:Yoshimura]] (batshit insane and concertedly sadistic). Weirdly, they seem to be at peace by the end despite wanting to wipe out each other's sex.
* FanDisservice: The Arume's sexual habits are often rather ... [[{{Squick}} weird]], to put it mildly.
* FanService: Much, MUCH more in the manga, but the anime has some bikini shots.
%%* FlowerMotifs: The episode titles in the anime.
* GenderBender: The manga ''Tenshi no Bokura'' is about Kenzo, a boy turned female by an Arume experiment. [[spoiler:It turns this "Kenzo" was a mental copy of the original implanted into the body of an Arume. When the girl's memories return, they pretend Kenzo suffered DeathOfPersonality, but the reality seems like more of a SplitPersonalityMerge.]]
%%* GlowingEyesOfDoom: Hagino
%%* GratuitousEnglish: Hiroko's suspiciously apropos "KEEP WEIGHT" shirt.
* TheGuardsMustBeCrazy: Azanael is detained after an attack, but she manages to keep a secret control device for her fighter craft, which is repaired by the ships captain.
* HalfHumanHybrid: The Arume sometimes interbreed with Earth women.
%%* HandsomeLech: Kisagi from ''Tenshi no Itazura''.
* HotForStudent: When the Arume run schools, many of them seduce their female students. In ''Tenshi no Bokura'', they had a school that was, essentially, their seraglio, the girls having pretty much been raised to think that such was the norm.
%%* HumanAliens
* IdiosyncraticEpisodeNaming: The episode titles are [[FlowerMotifs scientific names of flowers]].
* IfItsYouItsOkay: In the original {{Manga}}, Ami feels this away about Yui after Yui rescues her. Also {{subverted}} in ''Tenshi no Bokura'' with Kotoko, who thinks she can fall in love with Shouta but can't get past the fact that he's a guy.
%%* ImperialStormtrooperMarksmanshipAcademy: ''Tenshi no Bokura'' is an egregious offender of this trope.
%%* InterspeciesRomance
%%* IntertwinedFingers: Evidence of Hagino and Mari's RelationshipUpgrade.
* InvisibleToNormals: Mari is the only one who can see [[spoiler:Tsubael's holographic projection.]]
* JumpingTheGenderBarrier: ''Tenshi no Bokura'' is about the gender-bent Kenzo and his male best friend Shouta, who are [[AliensMadeThemDoIt forced under threat of death]] to have sex, but end up falling in love anyway. [[spoiler:Bizarrely, Kenzo's mind was put into an Arume's body to ''overcome'' the original mind's lack of attraction to men--[[LampshadeHanging which is pointed out]] as [[VoodooShark patently stupid]], because why would a straight human ''guy's'' mind be more likely than an Arume's to want to have sex with a guy?]]
%%* KissingDiscretionShot: Combined with the above-mentioned {{censor steam}}.
%%* LeftHanging
%%* LoveAtFirstPunch: Well, a strangling-attempt...
%%* LoveableSexManiac: Yui
%%* LuminescentBlush: Everyone, incessantly. Everyone with human blood at least as the Arume have no shame. Hagino forms an exception, seeing how cautiously she treats Mari.
%%* MacrossMissileMassacre: At the most ridiculous, with FIGHTER PLANES.
* MarsNeedsWomen: ''Tenshi no Bokura'' reveals that they actually ''need'' men in order for their species to not die out in the near future. They even invaded ''for the sole purpose of getting our men''. Then they got cold feet at the last minute and took our women instead, as they are much hotter albeit useless for stabilizing the Arume population dynamics.
* TheMirrorShowsYourTrueSelf: When Nagino is tele-talking with Mari, she's invisible, but Sugawara sees her as a reflection in the water.
* MoodWhiplash: The anime bounces between SliceOfLife and SpaceOpera.
%%* NoSocialSkills: Ai from ''Maiorita Tenshi''.
* OlderThanTheyLook: Hagino looks about the same age as Mari, but is likely quite a bit older.
%%* OminousFloatingSpaceship During the invasion
%%* OneGenderRace
%%* OneGenderSchool as well
%%* PhlebotinumRebel: Yui, sort of.
* PleasePutSomeClothesOn: In ''Tenshi no Bokura'', Admiral Mariel walks around practically naked. When Shouta asks her to "put something on", [[ComicallyMissingThePoint she dons cat ears but remains otherwise undressed.]]
* PoweredByAForsakenChild: the Arume use human and synthetic children as living bomb disposal units.
* RayOfHopeEnding: [[spoiler:The anime ends with Hagino pulling a SenselessSacrifice at the beginning of the Arume Invasion. The Arume win. However, the DistantFinale 30 years later implies that humanity is on its way to a truce with the Arume.]]
%%* TheReveal
* SceneryGorn: In the ''Tenshi no Bokura'' manga, the characters live surrounded by devastated cityscapes, a grim reminder of the recent invasion.
%%* SceneryPorn
%%* SchoolPlay: Which is somehow really important to Hagino.
%%* SecondEpisodeMorning
%%* SenselessSacrifice: You'll know it when you see it. Somewhat impressively, it's ''also'' a StupidSacrifice, because the character's death could have easily been avoided without changing the result.
* ShowWithinAShow: Michiko's play is a thinly-veiled parallel to the main story [[spoiler:starring Hagino as Jeanne d'Arc.]]
* SituationalSexuality: Many of the humans engage in homosexuality in the gender segregated areas.
%%* SlapSlapKiss
%%* SleepCute
* SpaceWhale: The Blue looks like a mechanical whale.
* StrangeSalute: In ''Tenshi no Bokura'', Admiral Mariel insists on being saluted in a rather idiosyncratic way.
%%* ThereIsOnlyOneBed: In ''Maiorita Tenshi'' with Sachi and Ai. [[spoiler:Though this turns out to be [[RelationshipUpgrade a reason to be happy.]]]]
%%* TheTease: Hagino toward Mari--eventually. And then of course there's the abundance of teases in the mangas.
%%* TragicHero: [[spoiler:Hagino/Ekaril]]
%%* UnderwaterKiss
%%* VichyEarth
%%* WaveMotionGun
%%* WhatMeasureIsANonHuman
%%* WhereAreTheyNowEpilogue
%%* WholesomeCrossdresser: Shouta and Shinichi in ''Tenshi no Bokura''.
%%* WillTheyOrWontThey: Hagino & Mari. In the end [[spoiler:they do, but it doesn't last long.]]
%%* YourDaysAreNumbered: [[spoiler:The humans used to clean up Thought Arresting Weapons]]
%%* YouShallNotPass: [[spoiler:Azanael and then Ekaril at the end of the anime.]]
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