[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/yuriaw_9348.jpg]]
[[caption-width-right:350:Nami and Osa]]
-> '' Floating towards the water's surface ''
-> '' The string of fate draws us there ''
-> '' There is no need to fear ''
-> '' What tomorrow holds ''
-> '' If the two of us are together. ''
-> -Minamo Made (To the Water's surface)


''Aoi Shiro'' (''アオイシロ''), also known as ''Blue Castle'' in English, is a supernatural GirlsLove mystery visual novel created in 2008, that takes place within the same universe as ''VisualNovel/AkaiIto'', also made by Creator/{{Success}}.

This time the protagonist is a girl named Syouko Osanai, the new captain of the school kendo team. The kendo team goes to a temple for a training trip, but things start to get strange, especially when Syouko seems to remember coming to the place some time ago...

Originally for the PS2, ''Aoi Shiro'' was eventually ported to the PC in 2009.

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!!This game contains examples of:
* AmbiguouslyGay
* ActionGirl: Arguably quite a few characters but most prominently Migiwa fits this trope.
* AllMythsAreTrue: ...but don't necessarily matter
* AllThereInTheManual: Wanna know about Momoko's [[spoiler:secretly withheld romantic feelings for Yasumi]]? Want to see the oft-mentioned former president and vice-president of the kendo club? Better read the prequel manga found in ''YuriHime'' then, because you won't get any of that from the game.
* ArtifactOfDoom: The <>
* AxCrazy: The result of using too much power from the cursed sword.
* BackFromTheDead: Kaya, [[spoiler: AKA Natsu-nee-san.]]
* BackToBackBadasses: Syouko and Migiwa in several routes - including Migiwa's happy end.
* BadassNormal: Syouko, but especially Munetsugu, an old man with the swordsmanship to behead bulls in a single stroke and take on superpowered oni moving at speeds even ''he'' can't follow. Only twice is he ever defeated in one-on-one combat: the first time is in the climactic fight against [[spoiler:Kaya in her good end]] ([[spoiler:for all of two minutes, after which [[CrowningMomentOfAwesome he continues kicking ass]]]]); the second is in [[spoiler:the Grand Route]] ([[OffscreenMomentOfAwesome entirely offscreen]] [[spoiler:by Kaya, quite quickly]]).
* BarehandedBladeBlock: [[spoiler:Syouko in the Grand Route. It helps that her right hand was actually the <>]].
* BareYourMidriff: Kaya and her one button; also see Underboobs below. Also Migiwa.
* BerserkButton: The only way to ruffle up the cool and cocky Kohaku [[spoiler:if you're not Yasuhime]]? Call her the sekiganki. [[spoiler:"The one-eyed onmyouji is that person! Oniichi Hougen! Ba Rouryuu!"]]
* [[BeachEpisode Beach Scene]]: Almost every route has one, they serve no real purpose but to put the [[FanService girls in bikinis]] and make for awkward situations.
* BigBad: [[spoiler:Ba Rouryuu]]
** BiggerBad: [[spoiler: The Chaos inside the titular Blue Castle.]]
* BigDamnHeroes: In the Grand Route, Kaya, Migiwa, and Kohaku all appearing just as Munetsugu heads towards Syouko.
* BigEater: Momoko
* BittersweetEnding - In one of Yasumi's bad ends, [[spoiler:Yasumi decides to [[HeroicSacrifice jump into the Gate with the <> in order to close it]]... and to her complete shock, Syouko jumps in after her, embracing her as the glow of the Gate surrounds them]]. The End. Her bad ends are actually pretty sweet compared to [[TearJerker her normal ends]].
* CatScare
* CoolOldGuy: Yuukai. [[spoiler:Munetsugu, too, when he's actually on the good guys' side]].
* ContinuityCameo: Turns out Sakuya from ''AkaiIto'' went to college with Aoi-sensei, in a less obvious one Aoi-sensei also mentions that an acquaintance of a friend has spiritual powers and is grade school age; [[AkaiIto Tsudura]] anyone?
* CensorSteam: In the bath and [[spoiler:Kenki Kaya's wisps of miasma]].
* CleanPrettyReliable
* CuteMute: Nami
* CuteLittleFangs: Kohaku, Kaya.
* CuteSportsClubManager: Yasumi.
* DemonSlaying: Migiwa. Not demons but rather oni. Whatever.
* DidYouJustPunchOutCthulhu
* DoesThisRemindYouOfAnything: Although Aoi Shiro is not an eroge, all the blood-drinking scenes are EXTREMELY obviously stand-ins for sex. There's even have a special soft, romantic-porno style BGM track reserved for those scenes only. (This started with ''AkaiIto'').
** Also, the stretching scene between Syouko and Yasumi.
** A non-erotic appearance of this trope is during [[spoiler: Yasumi's Happy End: [[strike:Shurelia]]Nami/Yasuhime appears and sings [[strike:EXEC_SUSPEND/.]]Umi Tsunami to [[strike:seal Mir]]close the <>. EXEC_SUSPEND/. and Umi Tsunami are strikingly similar, and both are sung by Noriko Mitose.]]
* {{Dojikko}}: Kaya, of all people. Kendo is pretty much the only thing that she's not clumsy with.
* DoNotCallMePaul: Kohaku would like you to remember that her name is not Torahime ([[spoiler:not that Rouryuu listens]]). On a sadder note, she no longer uses [[spoiler: Kurou-sama]], either.
* EldritchAbomination: [[spoiler: The Sea God can be considered one; you can even go mad just by looking at him.]]
* EvilSorcerer: Ba Rouryuu
* ExpressiveHair: Momoko
* EyesAlwaysShut: Kohaku keeps her left eye closed [[spoiler:to hide her magic eye]].
* EyeScream: [[spoiler: Syouko stabs Ba Rouryuu's mystic eyes at Grand Route finale.]]
* {{Fainting}}: [[spoiler:During Yasumi's route, Kohaku thinks Yasumi fainted out of fear. Turns out Yasumi was merely sending out her soul to save Syouko]].
* FeminineWomenCanCook: Yasumi is the designated chef for the trip and the most traditionally feminine of all the path girls. Syouko can cook too, though, albeit not quite as well.
* FingerSuckHealing: Yasumi is ''very'' displeased when she catches Nami doing this to Syouko.
** ''Inverted'' in Migiwa's route, since blood can revitalize pretty much anyone.
* FlowerMotifs: White Camellia (tsubaki) grow all over the island, although they insist on calling them Sal trees (Shorea robusta), probably due to religious significance and its meaning in the language of flowers. They're also considered interchangeable because authentic Indian Sal trees [[DidTheResearch wouldn't actually grow in the location the game is set in]] anyway. Red tsubaki are an equally important motif.
* FromACertainPointOfView: How Yuukai justifies being able to drink alcohol, despite being a Zen Buddhist monk.
* FoodPorn: Every. Single. Meal.
* ForgottenChildhoodFriend: [[spoiler:Yasumi and Nami]]
* GenkiGirl: Momoko
* GhostMemory: [[spoiler:Syouko sees Yasuhime-sama's memories during Kohaku's route]].
* GodivaHair: Yasumi and Nami in the bath, [[spoiler:and Yasumi in spirit mode]]. Even Kohaku sports it at one point.
* GoldenEnding
* GondorCallsForAid: (manga only) [[spoiler: Aoi-sensei calling her college buddy Asama Sakuya, and the Senba oni-hunters mobilizing to answer the call from the Suten, which at that point are recovering from Kaya's attack. Basically, in the manga version, the AkaiIto casts are TheCavalry for the AoiShiro casts.]]
* GoodIsNotNice: In Yasumi's route mostly, Kohaku has a nasty habit of needlessly killing (directly or indirectly) Syouko, Yasumi, and anyone else who gets between her and the <>. (Her way of dealing with a sinister ritual of human sacrifice, for example, is... to kill the sacrifices first.) Turns out in other routes that she's actually [[spoiler:Migiwa's backup]]. Both Kohaku and Migiwa have their KickTheDog moments, as well.
* HeroicSacrifice: Several endings, like Munetsugu in [[spoiler:Kaya's good end]] and Yasumi in one of her ends.
* HideYourLesbians: Despite advertising and playing up its GirlsLove, the game does play itself fairly coy regarding any relationship confirmation. Yasumi's feelings for Syouko are blatant, and all of the main characters have ''some'' suggestive interactions with Syouko, but the closest Syouko ever approaches to romantic attraction is [[spoiler:with Kohaku]] of all people!
* HighlyVisibleNinja: Lampshaded by Syouko in Migiwa's route.
* HimeCut: Ayashiro. She's even nicknamed Hime by the other kendo team members.
* HowWouldYouLikeToDie: [[spoiler:To Syouko and Yasumi, Kohaku gives two options: crushed by Oniwaka or cut down by her]].
* HugeGuyTinyGirl: Kohaku and her familiar [[spoiler:and older twin brother]], Oniwaka.
* IHateYouVampireDad: The oni version, with [[spoiler:Kohaku and her foster father Rouryuu, who turned her into an oni]]. Their first meetings always include her complaining about how her faulty body requires such length periods of sleep.
* IllGirl: Yasumi; [[spoiler:turns out simple anemia is not the issue]].
* IdiotBall: Not by her own fault, but rather that of the player, Syouko holds this quite often. She wanders around on sinking rocks, runs about in raging storms, and falls into the ocean... many, many times.
* ImpaledWithExtremePrejudice: [[spoiler:Ba Ryouryuu]], complete with lots of blood.
* ImpracticallyFancyOutfit: Nami's outfit straddles the border between this and [[PimpedOutDress Pimped Out]] Kimono.
* ImprobablyFemaleCast: There are only ''five'' male characters in the entire game; two of them are rarely seen, one is only heard, one of them is a CoolOldGuy, and the final one is the BigBad.
** Considering it's a trip for a girls' sports team, is it actually ''improbable'' that the cast leans female?
* IndirectKiss
* IntertwinedFingers
* IntimateHealing - Blood is power, and there are some suggestive ways of extracting it, from [[spoiler:Yasumi's naked out of body vampire sessions]] to [[spoiler:Kohaku preferring Syouko's breasts to her neck]]. Even better is when [[spoiler:[[TwinThreesomeFantasy Nami and naked-ghost-Yasumi]]]] do this at the same time.
* KickTheDog: Migiwa and especially Kohaku do this in many endings, usually killing someone irrevocably possessed by the Sword or some other sort of bad mojo. If you screw up your previous choices, Migiwa kills [[spoiler:Yasumi (a rampaging vampire spirit at the time) in Yasumi's route]].
* {{Kimodameshi}}: Momoko organizes one of these for the club.
* KissingCousins: [[spoiler:Syouko and Kaya, a.k.a. 'Natsu-neesan']]
* KendoTeamCaptain: Syouko
* LaserGuidedAmnesia
* LesbianVampire: Well considering it is in the same universe as ''AkaiIto''...
* LetsYouAndHimFight: Expect to be killed by good-intentioned, but misdirected, characters. A lot.
* LittleMissBadass: Kohaku
* LighterAndSofter: While having more "bad endings" then Akai Ito, it's , quote on quote, so called "Good endings" are severely less depressing then Akai Ito's. Though the Normal Ones are just as sad. And the mood of the game is overall less dark. (Shown in it's Motiff. Akai Ito's is Blood, while Aoi Shiro's is water.)
* LoadBearingBoss: Matamu's defeat in Nami's route causes the sanctuary to start collapsing, for whatever reason.
* MaleGaze: One of the beach scenes spends an awful lot of time zoomed in on Yasumi's breasts.
* TheManBehindTheMan
* MayflyDecemberRomance
* MiniGame - Getting the final happy ending unlocks a 2D HackAndSlash minigame in the main menu that has [[GuideDangIt no apparent connection]] whatsoever to the main story.
* MsFanservice: While ''Aoi Shiro'' is a rather tame game and Kaya is much much more than a pair of walking breasts, she never does learn how to button her shirt properly. At the end of Migiwa's route, she even fights Migiwa topless, with only a convenient miasma floating over certain areas.
** Also, Yasumi, who ends up naked or wearing revealing clothing a lot more frequently than one would expect.
* MultipleEndings: Fifty-six of them, in fact! Each route has one Happy End where you resolve the conflict, Normal Ends where Syouko survives, and Bad Ends where Syouko dies. (The normal "[[ExactlyWhatItSaysOnTheTin Possessed by the <>]]" end in Kaya's route is the odd exception; every ''other'' time Syouko is irrevocably possessed, it counts as a bad end.) Completing all of the other routes unlocks the Grand Route, where all of the characters team up.
** There are also a couple of non-standard endings. The most obvious being if you take the option of calling the training camp off because of the weather. It counts as a Normal End in the sense that Syouko survives but the story of which ever route you were in (the option occurs in all of them) being resolved.
* MysticalWaif: Nami, who is the TropeImage.
* NamedWeapons: Kumouchi, Hoemaru, Ryuugeki. Strangely averted with the <> outside Kohaku's route, where its name is revealed to be [[spoiler:Ame no Murakumo]]--not that the name gets much use there, either.
* NerfArm: That poor wooden sword; not much good against real steel.
* NotGrowingUpSucks: Kohaku embodies this trope the most. Yasuhime and [[spoiler:Nami]] also are stuck perpetually young but don't angst about it on camera.
* NotQuiteDead: [[spoiler:On her first visit to Unasaka, Syouko was partially beheaded and fell into the water. Luckily, Yasuhime saved her. Unluckily, no one gave Kaya the message.]]
* ObliviousToLove: Syouko is ''completely'' oblivious to poor Yasumi's blatant feelings for her. Momoko knows but never outright tells Syouko.
* TheOjou: Ayashiro
* OminousLatinChanting: Some of the BGM, especially anything involving the Gate.
* TheOneGuy: Monk Yuukai
* OurVampiresAreDifferent
* OutOfClothesExperience - [[spoiler:Yasumi, quite frequently.]]
* ThePromise: Syouko's promise in Yasumi's route to protect her. It's brought up quite a bit.
* PinkySwear
* RapunzelHair: Nami; it's implied she's never had it cut.
* ReallySevenHundredYearsOld: [[spoiler:Kohaku, Yasuhime, and Nami]]
* RedEyesTakeWarning: [[spoiler:Ba Rouryuu]]. Subverted with [[spoiler:Kohaku]], who we're led to believe is a baddie for quite a while.
* RedOniBlueOni: Migiwa and Syouko respectively; just look at their preferred colors. However, despite Syouko's cool exterior and Migiwa's playful one, Syouko's far more reckless.
* RoaringRampageOfRevenge: [[spoiler:Kaya is really pissed off since she thinks Syouko is dead]]; her mission is to kill those who she deems responsible. [[spoiler:Kohaku also in one bad end after finding out Yasuhime and Oyasu are one and the same decides to take revenge on the Nekatas and anyone in her way. Bad end, so that means you, too.]]
* RulesLawyer: Yuukai. Hence, being able to drink alcohol and eat meat in a Buddhist temple while technically not doing anything prohibited.
* SaveScumming: Due to the massive number of bad ends.
* SayMyName: ROURYUU! ROURYUU! BA ROURYUU!
* ScaryShinyGlasses: Aoi-sensei is prone to these when she's in the midst of a talking about a particularly gory legend or ghost story.
* SceneryPorn: The CG is undeniably gorgeous. What takes the cake, is the Blue Castle. A stunning Lapis, almost EldritchLocation. The time you first see it in the Grand Route will take your breath away. By all means a beautiful game, that's on par with most high budget animes. However...
** SceneryGorn:..as is the fountains of blood, countless deaths of your character, decapitations, and [[spoiler: Eldritch horrors ]]
* SecretTestOfCharacter: [[spoiler:Kohaku eggs Syouko (wielding the <>) into a duel to see if she is capable of wielding it without losing her sense of self]].
* SempaiKohai: Syouko and Ayashiro are sempai to Momoko and Yasumi; both are also greatly admired.
* SexySoakedShirt: Sexy scene in wet kimono.
* SingleStrokeBattle: Munetsugu is fond of this.
* SmashingWatermelons: According to Momoko a trip to the beach just isn't complete without it.
* SpoilerOpening: In case you never bothered to watch it, in order (and not comprehensive): [[spoiler:Kaya is not dead, there is a forest of red tsubaki that will scatter, Nami is Yasuhime, Yasumi is Syouko's childhood friend, Nekata killed Kaya, various bad ends, and the appearance of the big bad]].
* SummonMagic: GoddamnBats and a GiantMook.
* SuperpoweredEvilSide: [[spoiler: Kaya and Syouko, when completely corrupted by the Sword.]] At least for the former, it's [[EvilIsSexy sexy]].
* TakingYouWithMe: [[spoiler:Ba Rouryuu summons a nasty entity that consumes him in the process after Syouko stabs out his mystic eye.]]
* TalkingIsAFreeAction - During Kaya/Munetsugu's final fight in Kaya's route.
* TheManyDeathsOfYou
* ThemeMusicPowerUp: [[spoiler: Not a guarantee for a non-Bad Ending...]]
* TomboyAndGirlyGirl: Most notably used in Yasumi's route with Syouko/Yasumi.
* {{Tsurime Eyes}}: Fittingly, Kaya and Kohaku; also, much less fittingly, Ayashiro.
* UndeadTaxExemption: After the events in the game, Kaya is simply alive again in the eye of the society. She was even offered to continue her job as a cop. This despite missing for eight years ''without explanation'', and looking exactly like she was the day she was missing [[spoiler:, and possibly is an ''actual undead'']]. Granted, there were some papers to be processed...
* {{Underboobs}}: Kaya doesn't seem to like buttoning anything more than the top button of her shirt, [[{{Fanservice}} not that anyone minds]].
* UpdatedRerelease: The PC version. It fixed a good deal of the CG, and added two mini-routes, along with the much larger grand-route.
* {{Unwinnable}}: Not helping Migiwa when she falls into the water in Day Two of her route causes her to glare at you afterward but apparently nothing more... until the last scene of the game, where you are suddenly hit with a bad end.
** More than one bad ending is a result of making some completely unrelated choice earlier in the game.
* VillainsOutShopping: Syouko and friends meet a fairly-friendly Ba Rouryuu in the shopping district, though they don't know who he is at that point.
* WellIntentionedExtremist: [[spoiler:Munetsugu]]
* WingdingEyes: Momoko
* WistfulAmnesia: Syouko in the normal end [[spoiler:"The Gap in the Shape of You in My Heart" in Yasumi's route]], though "''[[BigNo despairing]]'' amnesia" is probably a better term.
* WholesomeCrossDresser: Kohaku ([[spoiler:who in her previous life was a double for her brother]]). Though not quite a {{Bifauxnen}}, there were some who (prior to the release of the game) were unsure about her. Considering the kind of [[GirlsLove game it is]], though.
* WorthyOpponent: What Migiwa and Syouko end up being by the end of Migiwa's route--this is even the title of her happy end, [[spoiler:in which the two end up on opposite sides of the kendo tournament bracket and promise to meet again in the finals]].
* GirlsLove
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