Fushigiboshi No Futagohime ([[ExactlyWhatItSaysOnTheTin "Twin Princesses Of The Wonder Planet"]]) is a {{shoujo}} MagicalGirl series from the director of ''Anime/SailorMoon'', Junichi Sato. Initially a [[ concept with its own interactive webpage]] by BIRTHDAY (also known for their ''VideoGame/DaikaijuuMonogatari'' games), Hal Film Maker took the idea and adapted it into an anime, which began in April of 2005.

Fine and Rein are fraternal [[AlwaysIdenticalTwins twins]] who are also [[EverythingsBetterWithPrincesses princesses]] of the Sunny Kingdom, one of the seven kingdoms of the Wonder Planet, a hollow planet with a floating sun in the middle. They also happen to be [[InformedAbility "the most un-Princesslike Princesses ever"]]. Fine (the red-haired one) is a {{Tomboy}} with a love of [[BigEater sweet things]] while Rein (the blue-haired one) is a GenkiGirl who loves cute things but gets [[LoveMakesYouCrazy a little insane when it comes to romance]].

Unfortunately, the floating sun is starting to lose its power. As the Princesses of the kingdom that looks after the sun, Fine and Rein are secretly tasked by Princess Grace the legendary hero of the Sunny Kingdom to investigate the source of the sun's troubles. And to do so, they get the power to change into [[PimpedOutDress super poofy dresses]]. Don't question it, just run with it. Later takes a [[CerebusSyndrome decidedly dark turn]].

It later got a second series, ''Fushigiboshi No Futagohime Gyu!'', in which Fine and Rein get sent to [[BoardingSchool Princess School]] in order to receive a certification that will allow them to become Queens. During the orientation of new students, they are presented with a legendary bell that will only ring when a certain person, [[TheChosenOne destined to become the "Universal Princess"]] touches it. Until this time, the bell has never rung until Fine and Rein touch it, transforming them into [[FrillyUpgrade newer, frillier, poofier dresses]]. Meanwhile, a strange dark entity has begun to possess people all over campus, causing them to descend into irreversible depression. Unlike the previous series, it follows a standard MonsterOfTheWeek format and delves into MagicalGirlWarrior themes instead of the CuteWitch style it originally had (presumably due to the success of a similar format in the second half of the original series). Part of the reason of why it was different was because Junichi Sato left in the beginning of its run, most likely due to CreativeDifferences. [[BrokenBase Some cite the sequel as something that should have never existed]]

This series is notable for its extremely high level of sugary sweetness and for the [[ErmineCapeEffect most impractically poofy princess dresses ever]], where [[FrillsOfJustice the amount of frills is directly proportional to magical power]].

%%For all tropes relating to specific characters, please list them on the character sheet
!!This series has examples of:

* AdaptationExpansion: There's a lot of this, but for starters, contrary to the original concept's solid seven, the anime went out of its way to introduce a secret eighth kingdom on the Wonder Planet, known as the Ocean Kingdom, guarded by Princess Pearl.
* AllGirlsWantBadBoys: Fine, at least, really prefers [[DarkIsNotEvil Eclipse/Prince Shade]] over Prince Bright.
* AllThereInTheManual: The character fanbooks and BIRTHDAY's original webpage gives small details to the characters that aren't revealed in the show. For example, Fine and Rein are both eight years old, Bright received Ruby on his tenth birthday, and Shade received Regina (a desert lizard) at the age of five.
* AlmostKiss: [[spoiler:Rein and Eclipse]] nearly share one in the manga... [[spoiler:only to be cockblocked by Milky!]]
* AlphaBitch: Altezza, in the earlier episodes. She grows into a LovableAlphaBitch as the series progresses.
* AsLongAsThereIsEvil: [[spoiler:The Black Crystal.]]
* BattleThemeMusic: FLIP-FLAP's "Miracle Gemini Gyu" becomes the battle theme for Fine and Rein in ''Gyu!''
* {{Beach Episode}} : Episode 21, in ''Gyu!''
* BreakTheHaughty: Altezza in the earlier episodes.
* ButtMonkey: Tio, and to a lesser extent, Altezza.
* ChekhovsGunman: [[spoiler:Naginyo, in the first series, proves to be a stock character who just shows up at random parts in OnceAnEpisode just to sing random songs on his harp while [[{{Squee}} charming the ladies]]. Then, 20 episodes later, it turns out he was a messenger sent by Princess Grace THE WHOLE TIME.]]
* ClapYourHandsIfYouBelieve: [[spoiler:This is essentially how Fine and Rein defeat the BigBad in both series.]]
* DancingTheme: The first opening theme, "Princess wa Akiramenai", had a little bit of dancing and the twin vocalists of the song, FLIP-FLAP, also did the same dance in a live-action music video version. Similarly, the first ending theme, "Oshare Fantasy", had a little dance sequence and there was a segment in one of the DVD extras that taught the dance.
* DisappearedDad: All the families in the Wonder Planet are nuclear families... except for the Moon Kingdom, where there ''is'' a queen, but not a king. In fact, we don't even know who and ''if'' Shade and Milky ever had a father...
* DoggedNiceGuy: Auler... not because of the UnusualEars he has, of course!
* ErmineCapeEffect
* EvilCostumeSwitch: [[spoiler:Bright, when he is possessed by the Black Crystal]].
* EveryEpisodeEnding: In the first series, after the [[OnTheNext episode preview]], every episode ended with a "lucky item" segment where Fine and Rein tell the little girls watching the show which item to carry around for good luck.
* EverythingsBetterWithPrincesses: About ''eighteen'' of them in the first series alone.
* EverythingsBetterWithRainbows: The opening scene of every episode in the first season shows a rainbow in ''space''.
* FinishingEachOthersSentences: Fine and Rein tend to do this, though not as often as they SpeakInUnison.
* TheForce: The Prominence
* FrillsOfJustice
* GenkiGirl: Fine and Rein both.
* GratuitousEnglish
* HappilyEverAfter: Of ''course''.
* HeroicSacrifice: [[spoiler:Poomo, in the final episode of the first series]], [[DisneyDeath not that it lasts]].
* HollowWorld
* HostageForMacGuffin: [[spoiler:Chancellor Roman captures Bright and forces Fine and Rein to exchange the Prominence for his life.]]
* IKnowYoureInThereSomewhereFight: [[spoiler:This happens during a lot of confrontations with Bright near the end of the first series.]]
* ImpracticallyFancyOutfit
* InherentlyFunnyWords: InUniverse. Gabin, a word once said by Altezza. [[spoiler:It's the only thing that makes the Bo Dragon laugh.]]
* InvoluntaryDance: The Feather Myuugram.
* JerkWithAHeartOfGold: Eclipse.
* LateArrivalSpoiler: It's pretty obvious Eclipse is Prince Shade from the Moon Kingdom once Shade is formally introduced in the series. On the official website, Eclipse was listed in the section for characters with an unspecified region as a separate character than Prince Shade. Once TheReveal happened, Eclipse's profile explicitly states that he is Shade.
* LoadsAndLoadsOfCharacters
* LoserProtagonist: The majority of the princesses win Princess Parties ''because'' of Fine and Rein's help, but the two have never won one. This was averted in the manga, where they win the final Princess Party.
* LuckyCharmsTitle
* {{MacGuffin}}: The whole Grace Stones ordeal.
* OddlyNamedSequel: Futago Hime ''Gyu!'', with "gyu" being a Japanese onomatopoeia for squeezing (often used for hand squeezing or tight hugs).
* OfficialCouple: Fine/Shade, Rein/Bright, Altezza/Auler, Elizabeta/Fango, Calorie/Tauri, Milro/Pastel... and that's not even including the kings and queens! Even [[PuppyLove Milky and Nalro]] got some {{Ship Tease}} before they even learned how to speak!
* PaperThinDisguise: Eclipse as "Shade."
* PeacockGirl
* PettingZooPeople: Most of the inhabitants of the Wonder Planet
* PimpedOutDress: The base dresses that the princesses (aside from Fine and Rein) tend to wear most of the time. Fine and Rein get [[SheCleansUpNicely dolled up]] when going to most Princess Parties. Both of their dresses while transformed [[BuffySpeak out-pimp]] all of these...and that's just the first series!
* PowerTrio[=/=]ThreeAmigos: Fine, Rein, and Poomo act as a trio throughout the series, although you can substitute Poomo for Lione if you want a more human counterpart. In the second half of the series, Altezza replaces Lione in the role. The trio formation becomes crucial to ''Gyu!'' to the point where the students ''must'' create teams of three, hence Team Gemini (Fine, Rein, Chiffon), Team Celeb (Elizabeta, Sasha, Carla), Team Jewel (Altezza, Sophie, Lemon), Team Samba (Lione, Calorie, Asuri), etc.
* PrinceCharming: Bright.
* PrincessClassic
* PrincessesPreferPink: Fine
* PutOnABus: The writers of ''Gyu!'' use this trope ''immensely''. The show introduces new princesses and princes while ignoring even the royal families of the Wonder Planet. In other words, if you're looking for anyone who is ''not'' Fine, Rein, Poomo, Chiffon, and Bibin, prepare to be massively disappointed. Even ''Auler'' doesn't show up as much as he should have. Alongside that, even the new princesses and princes are basically ignored after having one episode to themselves [[spoiler:Thomas]] gets this the worst, [[spoiler:as shortly after his HeelFaceTurn, he disappears for about 20 episodes, and when he finally returns to the Academy, he is DemotedToExtra]].
* RebelliousPrincess: Fine and Rein, to the point of being labeled the "most un-princesslike princesses in the history of the Wonder Planet".
* RequisiteRoyalRegalia
* RoyalBlood
* SiblingTeam
* SpeakInUnison: Fine and Rein frequently do this. Justified since they're nigh-inseparable twins.
* SpellMyNameWithAnS: Rein's name was written as "Rain" in the first eyecatch of the series, but producer Junichi Sato decided to stick with calling her "Rein" because he didn't want her to be associated with the weather rain.
** Milro has an interesting case since her name was spelled "Mirlo" in the first [[AllThereInTheManual character fanbook]], but "Milro" in episode 19 and in the second character fanbook. One has to wonder if "Mirlo" was a typo or if TheyJustDidntCare about the proper romanization of her name. Last, some fansubs write her name out by her literal Japanese pronunciation, "Miruro", but it's not {{Word of God}} so it has less validity than her other names. The fansubs romanized Truth's name as "Toulouse" and Altezza's as "Altessa" before the character fanbook came out with the official romanizations. Some people still refer to the characters by their fansub names.
* [[StopHavingFunGuy Stop Having Fun Girl]]: Altezza takes the "Best Food Princess" competition a [[SeriousBusiness little too seriously]]... Heck, episode 22 reveals that she [[HardWorkHardlyWorks trained more diligently]] for the previous parties than all the other princesses ''combined''.
* SugarBowl: The Wonder Planet is very cute and friendly.
* SuspiciouslySimilarSubstitute: In ''Gyu!'', the vice principal of the Royal Wonder Academy resembles Chancellor Roman from the first series, from the character design to even his voice actors. The same treatment is given to Rarau and Yayan, the vice principal's assistants, who seem to be [[{{Expy}} Expies]] of Rau and Yan, Roman's mooks, in the first series.
* SwissArmyTears: [[spoiler:When Fine and Rein lose their hearts permanently after defeating the Black Crystal Planet, it takes Bright and Shade's ManlyTears to revive them.]]
* ThemeMusicPowerUp
* TransformationIsAFreeAction: On a number of times, Fine and Rein transform right when something bad is on the verge of happening. Said bad thing, if happening in real time, would've caused damage by the time they finished transforming...
* TransformationSequence
* TransformationTrinket: The Sunny Luches
* TrueBlueFemininity: Rein
* WeightWoe: In the Best Sports Princess chapter in the manga, Rein becomes worried about participating due to her recent weight gain.
* WhatTheHellHero: During the Best Sweets Princess Party, [[NiceJobBreakingItHero Fine and Rein inadvertently destroy Altezza's entry]] while helping Lione. When they go to apologize to Altezza, Altezza becomes rather pissed instead of remorseful at what they have to say. Fine and Rein end up yelling at her and losing all of their princess levels.
* WheelOFeet
* WonderTwinPowers: Although Fine and Rein can use the Prominence and the Feather Mewgram by themselves, they need each other to transform and use their most powerful magic. This is also prevalent in ''Gyu!'', where their twin angel mascots, Pyupyu and Kyukyu, are needed to help them transform.
* ZeppelinsFromAnotherWorld: More like hot-air balloons, but it still fits the bill. Each kingdom has one, all looking ''very'' different. All are used to get to [[FloatingContinent Sunny Kingdom]].