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Now defunct
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* ADateWithRosiePalms: Implied to be done by Shougo in episode 5 when his sister calls him and tells him that he shouldn't be staying up so late doing such naughty things. He doesn't outright deny it, saying he doesn't do that every night. And in the beginning of episode 9, he seems to be doing this, until the camera pans out to reveal his entire body, and shows that he was simply exercising on his bed despite his suggestive grunting.
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* MistakenForMasturbating: In episode 5, Shougo's sister calls him and tells him that he shouldn't be staying up so late doing such naughty things, thinking he was masturbating. He doesn't outright deny it, saying he doesn't do that every night. And in the beginning of episode 9, he seems to be doing it, until the camera pans out to reveal his entire body, and shows that he was simply exercising on his bed despite his suggestive grunting.
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''Kono Naka ni Hitori, Imouto ga Iru!'' (''One of the Girls Here is My Little Sister!'') is a LightNovel series with similarities to ''VisualNovel/PrincessLover'' and ''LightNovel/{{Oreimo}}''.
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%% * GettingCrapPastThe Radar: Due to overwhelming and persistent misuse, GCPTR is on-page examples only until 01 June 2021. If you are reading this in the future, please check the trope page to make sure your example fits the current definition.
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Up To Eleven is a defunct trope
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* InnocentFanserviceGirl: Mizutani is unaware of how babies are made, and after Shougo hands her a pamphlet on how it's done, she immediately wants to "practice" it with him. Then Miyabi and Konoe walk in on them as Mizutani is on top of him in bed. She cranks it UpToEleven in episode 7, stretching out while wearing nothing but a towel around her shoulders. While Shougo is still uncomfortable around it, he seems to less offended by than he originally was.
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* InnocentFanserviceGirl: Mizutani is unaware of how babies are made, and after Shougo hands her a pamphlet on how it's done, she immediately wants to "practice" it with him. Then Miyabi and Konoe walk in on them as Mizutani is on top of him in bed. She cranks it UpToEleven up to eleven in episode 7, stretching out while wearing nothing but a towel around her shoulders. While Shougo is still uncomfortable around it, he seems to less offended by than he originally was.
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* BarbieDollAnatomy: Happens briefly to Miyabi in episode 10 shortly after she's done taking a shower.
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* BarbieDollAnatomy: Happens briefly to Miyabi in the broadcast version of episode 10 shortly after she's done taking a shower.
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Nice Hat is now dewicked
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* NiceHat: Mizutani often wears one. In fact, it's her trademark when she's in disguise. Mei wears a nice witch hat all the time.
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* RapunzelHair: Konoe's long hair reaches past her buttocks.
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* DangerouslyShortSkirt: Standard part of the uniform for the girls.
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Gendered redirects are allowed.
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This work shares similarities with ''VisualNovel/PrincessLover'' and ''LightNovel/{{Oreimo}}''.
Viewers in the United States can watch the anime legally at Crunchyroll under the name ''[[http://www.crunchyroll.com/nakaimo-my-sister-is-among-them Nakaimo - My Sister is Among Them!]]''. Sentai Filmworks released the series on DVD as ''NAKAIMO - My Little Sister is Among Them!'', and has put the series up for legal streaming on The Anime Network under that title.
Viewers in the United States can watch the anime legally at Crunchyroll under the name ''[[http://www.crunchyroll.com/nakaimo-my-sister-is-among-them Nakaimo - My Sister is Among Them!]]''. Sentai Filmworks released the series on DVD as ''NAKAIMO - My Little Sister is Among Them!'', and has put the series up for legal streaming on The Anime Network under that title.
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Viewers in the United States can watch the anime legally at Crunchyroll under the name
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* BishieSparkle: Mizutani has this around her when she's walking home with Shougo in episode 2. Since she's supposed to be a guy, the fact that she was clinging to his arm the entire way home made some of the students suspect they were [[HoYay gay]].
* BlackMail: Shougo's sister in episode 7 makes a broadcast over the school's PA system telling him not to find out who she is, or she's going to reveal secrets which she says are best left undiscovered.
* BlackMail: Shougo's sister in episode 7 makes a broadcast over the school's PA system telling him not to find out who she is, or she's going to reveal secrets which she says are best left undiscovered.
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* BishieSparkle: Mizutani has this around her when she's walking home with Shougo in episode 2. Since she's supposed to be a guy, the fact that she was clinging to his arm the entire way home [[MistakenForGay made some of the students suspect they were [[HoYay gay]].
*BlackMail: {{Blackmail}}: Shougo's sister in episode 7 makes a broadcast over the school's PA system telling him not to find out who she is, or she's going to reveal secrets which she says are best left undiscovered.
*
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* CantHoldHisLiquor: Miyabi gets drunk after one glass of wine in episode 10, which she mistook for grape juice. According to Sagara, she took it in one gulp.
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* CantHoldHisLiquor: CantHoldHerLiquor: Miyabi gets drunk after one glass of wine in episode 10, which she mistook for grape juice. According to Sagara, she took it in one gulp.
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Sexy Discretion Shot misuse, replaced with appropriate trope
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* [[CantHoldHisLiquor Cant Hold Her Liquor]]: Miyabi gets drunk after one glass of wine in episode 10, which she mistook for grape juice. According to Sagara, she took it in one gulp.
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* [[CantHoldHisLiquor Cant Hold Her Liquor]]: CantHoldHisLiquor: Miyabi gets drunk after one glass of wine in episode 10, which she mistook for grape juice. According to Sagara, she took it in one gulp.
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* EarnYourHappyEnding: In the novels, [[spoiler:it turns out that Miyabi is his cousin and Konoe was the illegitimate daughter, but they later discover that she's not blood related to Shougo (since Shougo isn't blood-related to his father Kumagoro). Miyabi's father Kazuma marries Kanoko, Miyabi becomes Shougo's step-sister and Konoe as his lover.]]
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* EarnYourHappyEnding: In the novels, [[spoiler:it turns out that Miyabi is his cousin and Konoe was the illegitimate daughter, but they later discover that she's not blood related blood-related to Shougo (since Shougo isn't blood-related to his father Kumagoro). Miyabi's father Kazuma marries Kanoko, Miyabi becomes Shougo's step-sister and Konoe as his lover.]]
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* ModestyShorts: Miyabi.
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* NoPeekingRequest: When the seemingly {{Bishonen}} Ikusu showers at Shougo's place, he makes sure to ask Shougo not to peek under any circumstance, and Shougo agrees, privately thinking it's a weird thing for a guy to ask. Just as Ikusu is finishing showering, Shougo remembers the bathroom has no towels, so he brings one over, and enters the bathroom [[ShowerOfAwkward just as Ikusu is stepping out]], causing Shougo to find out [[GenderReveal Ikusu is actually a girl]]. She [[ShamelessFanserviceGirl doesn't actually seem to mind it]] after though and starts [[HomeNudist hanging out nude in his house right after]].
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** Miyabi also delivers one to him shortly after. [[spoiler:She played with him at the hospital when Kazuma was getting check ups, fell in love with him there, and they often pretended to be married. So when he transferred to her school, she was happy to see him again.]]
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** Miyabi also delivers one to him shortly after. [[spoiler:She played with him at the hospital when Kazuma was getting check ups, checkups, fell in love with him there, and they often pretended to be married. So when he transferred to her school, she was happy to see him again.]]
* SceneryCensor: Used quite heavily with Mizutani, along with ToplessnessFromTheBack and LensFlareCensor, since she [[HomeNudist likes to exercise in Shougo's apartment naked]]. Although, most of it's uncensored in the DVD version.
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* SecretKeeper: Mei had intended to keep one from Shougo, for good reason. See ThePlan.
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* SecretKeeper: SecretKeeper:
** Mei had intended to keep one from Shougo, for good reason. See ThePlan.
** Mei had intended to keep one from Shougo, for good reason. See ThePlan.
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* SexyDiscretionShot: Used quite heavily with Mizutani, since she likes to exercise in Shougo's apartment naked. Although, most of it's uncensored in the DVD version.
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* StalkerWithACrush: Shougo hears a girl's voice in the first episode who claims to be his long lost sister. She proclaims that she's going to marry him, and will usually call him and tell him she saw what he was doing earlier that day/episode.
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* StalkerWithACrush: Shougo hears a girl's voice in the first episode who claims to be his long lost long-lost sister. She proclaims that she's going to marry him, and will usually call him and tell him she saw what he was doing earlier that day/episode.
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* StudentCouncilPresident: Mana Tendou. Rinka Kunitachi is the Vice President, despite being a first year.
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* StudentCouncilPresident: Mana Tendou. Rinka Kunitachi is the Vice President, despite being a first year.first-year.
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* ThanksForTheMammaries: Shougo does this accidentally to Rinka in episode 2 after Mana accidentally knocks them over.
** He does it again in episode 8, although this time it was due to the ride they were in losing power and everything going black, as well as Rinka panicking during the blackout.
** He does it again in episode 8, although this time it was due to the ride they were in losing power and everything going black, as well as Rinka panicking during the blackout.
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* ThanksForTheMammaries: Shougo does this accidentally to Rinka in episode 2 after Mana accidentally knocks them over.
**over. He does it again in episode 8, although this time it was due to the ride they were in losing power and everything going black, as well as Rinka panicking during the blackout.
**
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* {{Tsundere}}: Miyabi. Surprisingly she shows more of a Type B "deredere" than Type A "Tsuntsun" toward him after their initial meeting.
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* {{Tsundere}}: {{Tsundere}}:
** Miyabi. Surprisingly she shows more of a Type B "deredere" than Type A "Tsuntsun" toward him after their initial meeting.
** Miyabi. Surprisingly she shows more of a Type B "deredere" than Type A "Tsuntsun" toward him after their initial meeting.
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* InformedAbility: The School President is been said to be serious when it comes to her work but will act childishly when having fun. So far every time she is on screen she is just acting childishly. (Thankfully, her serious side is only mentioned the first time she appears, so it might have been the writers' initial intentions and remained in the script by accident.)
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* InformedAbility: The School President is been said to be serious when it comes to her work but will act childishly when having fun. So far every time she is on screen she is just acting childishly. (Thankfully, her serious side is only mentioned the first time she appears, so it might have been the writers' initial intentions and remained in the script by accident.)
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* HotForTeacher: One of the male students, Tanaka has shown to have an obvious crush on his teacher Kotori-sensei. Which every time he vocalizes it, causes her to hit him with something.
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* GettingCrapPastTheRadar: When Rinka and Shougo are at the amusement park, they enter a dark ride and Rinka gets blasted by liquid in a manner consistent with a girl who just had sex.
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%% * GettingCrapPastTheRadar: When Rinka GettingCrapPastThe Radar: Due to overwhelming and Shougo persistent misuse, GCPTR is on-page examples only until 01 June 2021. If you are at reading this in the amusement park, they enter a dark ride and Rinka gets blasted by liquid in a manner consistent with a girl who just had sex.future, please check the trope page to make sure your example fits the current definition.
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zetai ryouiki has been made Definition Only; no on-page examples
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* ZettaiRyouiki: Konoe Tsuruma in her school uniform and the maid uniform.
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[[quoteright:225:https://static.tvtropes.org/pmwiki/pub/images/39587_4237.jpg]]
[[OnOneCondition In accordance with his father Kumagoro's will]], Shougo Mikadono transfers to the school that his future wife is said to be attending. But also attending the school is Shougo's younger sister, who was separated from him at birth, and he doesn't know what she looks like - but she attempts to [[StalkerWithACrush get close to him without revealing who she is]]! Can Shougo figure out which of the girls at this school is his sister and find his destined life partner at the same time?
This work shares similarities with ''VisualNovel/PrincessLover'' and ''LightNovel/{{Oreimo}}''.
Viewers in the United States can watch the anime legally at Crunchyroll under the name ''[[http://www.crunchyroll.com/nakaimo-my-sister-is-among-them Nakaimo - My Sister is Among Them!]]''. Sentai Filmworks released the series on DVD as ''NAKAIMO - My Little Sister is Among Them!'', and has put the series up for legal streaming on The Anime Network under that title.
----
!!This light novel series provides examples of:
* AboveTheInfluence: But just barely for Shougo. In episode 3, both Miyabi and Konoe feed him various supplements to boost his virility, then they spend the night with him in his bed, to "train" him to only like girls after mistaking him for being HoYay with Mizutani.
* AbsurdlyPowerfulStudentCouncil: Rinka cracks down on things she deems immoral after Shougo's sister makes an announcement over the school's public announcement system, while some prominent business officials were visiting. She also makes him the morality officer, although he doesn't seem to be doing the job very well considering the girls are wooing over him still. And it later turns out that Rinka was responsible for the announcement.
* AccidentalPervert: Shougo is prone to these due to all of the teasing the girls like to do to him, such as when Miyabi intentionally lifts her skirt up in episode 8, then a gust of wind blows through the area.
* ACupAngst: Miyabi. Other times she acts with PetitePride.
* ADateWithRosiePalms: Implied to be done by Shougo in episode 5 when his sister calls him and tells him that he shouldn't be staying up so late doing such naughty things. He doesn't outright deny it, saying he doesn't do that every night. And in the beginning of episode 9, he seems to be doing this, until the camera pans out to reveal his entire body, and shows that he was simply exercising on his bed despite his suggestive grunting.
* ADayInTheLimeLight: Every girl gets at least one episode that largely centers on them.
* AlmostKiss: Shougo and Konoe nearly kiss in the first episode, but he pulls away at the last second.
* ArrangedMarriage: [[spoiler: Rinka is stuck in one, and doesn't seem very happy about it, as she's not interested in the guy her family set her up with but can't go against it because it's for business purposes.]]
* BalancedHarem: So far Shougo doesn't seem devoted to one particular girl, but Konoe and Miyabi seem to have a slight lead over the rest.
* BalloonBelly: Mana looks visibly pregnant in Episode 10 after pigging out at the Mikadono group party.
* BarbieDollAnatomy: Happens briefly to Miyabi in episode 10 shortly after she's done taking a shower.
* BigBrotherAttraction: See BrotherSisterIncest. The first years have also all taken to calling Shougo "Onii-san sempai".
* BigEater: Mana can put away quite a bit of food.
* BishieSparkle: Mizutani has this around her when she's walking home with Shougo in episode 2. Since she's supposed to be a guy, the fact that she was clinging to his arm the entire way home made some of the students suspect they were [[HoYay gay]].
* BlackMail: Shougo's sister in episode 7 makes a broadcast over the school's PA system telling him not to find out who she is, or she's going to reveal secrets which she says are best left undiscovered.
** [[spoiler:Only it wasn't directed at Shougo but at Genda, the head of the board of directors, as Rinka tells him in episode 8.]]
* BrotherSisterIncest: Shougo's sister seems intent on doing this with him, much to his disgust.
* ButtMonkey: Tanaka's never safe from being knocked down by Kotori.
* [[CantHoldHisLiquor Cant Hold Her Liquor]]: Miyabi gets drunk after one glass of wine in episode 10, which she mistook for grape juice. According to Sagara, she took it in one gulp.
* {{Catgirl}}: The [[OnTheNext next-episode trailer]] at the end of each episode has the main girls as [[SuperDeformed super deformed]] catgirl versions of themselves.
** The title of episode 6, "Cat-ear Maid Sisters", is self-explanatory. Konoe and Mei spend most of the episode wearing electronic ears and tails that [[http://www.neurosky.com/Necomimi/ respond]] to [[http://en.rocketnews24.com/2012/06/02/japan-develops-pulse-controlled-cat-tail-accessory-that-sways-back-and-forth-when-you-get-excited/ emotions]].
* CensorSteam: Rather than steam however, they darken the areas where Konoe's skirt lifts up in the broadcast version of episode 6
* ChekhovsGun: A subtle one, but [[spoiler: In episode 1, while hanging out at the park with Konoe, Shougo is introduced to the clock and the distinct music it plays every half hour. This is what helps him find Konoe when she goes missing in episode 4, as it plays in the background when she calls him to say goodbye.]]
** Its used again in episode 5 and 6, [[spoiler: when Shougo spots Mei's phone which is exactly the same as Konoe's. Except in her case, she was pretending to be his sister to protect his true sister's identity from him, so as to avoid scrutiny and shame for being Shougo's illegitimate sister by their father's company and family.]]
* ChildhoodMarriagePromise: [[spoiler:Shougo did this with Miyabi when they were kids in the hospital, and she's held him to that promise ever since he transferred to her school. Cue shocked reaction from both Shougo and Konoe.]]
* ClingyJealousGirl: After seeing Mizutani getting a bit [[HoYay too friendly with Shougo]] in episode 3, both Miyabi and Konoe both go to great lengths to make sure he's [[MistakenForGay not batting for the other team]]. He ends up running away from both of them at school as a result of this, and they both invoke this trope again when they accuse each other of trying to get ahead with him in a relationship.
** Both girls display this trope again at the end of episode 4, and agree to pursue Shougo fairly this time around, much to his chagrin. Cue more FanService as both of them again wake him up wearing little clothing...
** Every single one of the main girls in episode 9 [[spoiler: once they find out that Yuzurina is his sister,]] and all of them make claims as to why they should be taken to the social party that his mom set up for him, and tells him to bring a date.
** [[spoiler: And even Yuzurina isn't above this trope in episode 9, as she spots one of Mizutani's hairs on his floor, then sniffs his bed to find the scent of a woman on it. Later, she listens in on Konoe's FantasticArousal and slams the wall when she thinks they're taking it too far.]]
* {{Cloudcuckoolander}}: Mana Tendou tends to have these moments, much to Rinka's chagrin.
* CloudcuckoolandersMinder: Rinka for Mana.
* ContrivedCoincidence: It sure seems strange [[spoiler:that all of the calls Shougo receives from "his sister" all manage to sound exactly the same. While it could be accounted for by the the phone's voice changing ability (and is based on Yuzurina's voice in the anime), what's unusual is that they sound exactly like the girl from the beginning, who never phoned Shougo in that manner in the first place, and none of the other girls were present during that moment.]]
* CovertPervert: ''Everyone'' has varying shades of this. Yes, even [[Main.NiceGuy Shougo Mikadono]], [[Main.NiceGirl Konoe Tsuruma]], and [[Main.TheComicallySerious Rinka Kunitachi]]. [[spoiler: Looks like Yuzurina Houshou, the latest girl who claims to be Shougo's little sister, has shades of this too.]]
* CreditsRunningSequence: One happens in the closing credits with Shougo attempting to run away from the main girls in the show.
* CringeComedy: Though still quite sentimental and heartwarming in spite of it all.
* CuteLittleFang: Miyabi has one, but is only shown when she opens her mouth wide.
* CuteWitch: Mei Sagara dresses up like one as part of her standard outfit. She even dresses as one in episode 10 during the formal event.
* DangerouslyShortSkirt: Standard part of the uniform for the girls.
* DeclarationOfProtection:
** Shougo invokes this in episode 6, [[spoiler: when he tells Mei that he wants to know who his sister is in order to protect her and acknowledge her as his sister.]]
** He does this again in episode 8, [[spoiler: after Rinka tells him about her ArrangedMarriage, which she doesn't want, because she believes in marrying for love. He suggests that they pretend to be lovers so that her family would be forced to break off her engagement, and can then choose whoever she wants to really marry. Unfortunately for him, she doesn't want to pretend...]]
* DistractedByTheSexy: Miyabi deliberately invokes this in episode 8, when she arrives at school wearing a skirt that seems a bit too short, and forces Shougo to measure it. But she keeps teasing him and asking if he wants to look up her skirt, to which he hesitantly says no. Konoe then arrives, and demands he measure her skirt as well. [[spoiler: Then a wind gust blows through, and both girl's skirts are lifted. Shougo claims he didn't see anything, but then he mentions Miyabi wearing shorts, which angers her because that meant he looked up her skirt when the wind blew.]]
* DoesThisRemindYouOfAnything: When Konoe is cosplaying as a cat maid in episode 6, her tail is acting erratically, and Shougo tries to help her with it. But as he rubs and pulls on the tail, Konoe seems a bit too excited by it. Oh, and Episode 9 too, where Shougo and Konoe make weird sounds during the beginning [[spoiler: when Shougo was exercising]] and near the end of the second half [[spoiler: where Shougo [[Main.ItMakesSenseInContext tickles Konoe unless she leaves his bed]]]].
* DoubleStandardAbuseFemaleOnMale: Despite it being a total accident thanks to Mana, Shougo gets a roundhouse kick to his head from Rinka in episode 2 and again in episode 8 only he gets slapped instead.
** Both Shougo and Tanaka get hit by Kotori-sensei's swimming board in episode 9.
* EarlyBirdCameo: [[spoiler: Yuzurina can be seen with the board of directors visiting the school in episode 7, but we're not given any indications that its her other than a subtle smile towards him. It's also unusual that her hair is black in that episode, but then is brown in episode 9 when she reveals herself to him. Although it could be that she was trying not to seem too obvious to him and [[FridgeLogic simply dyed her hair]] at the time.]]
* EarnYourHappyEnding: In the novels, [[spoiler:it turns out that Miyabi is his cousin and Konoe was the illegitimate daughter, but they later discover that she's not blood related to Shougo (since Shougo isn't blood-related to his father Kumagoro). Miyabi's father Kazuma marries Kanoko, Miyabi becomes Shougo's step-sister and Konoe as his lover.]]
* EvolvingCredits: [[spoiler: After episode nine, Yuzurina replaces Shougo's sister's silhouette during the opening credits. She is also among the girls during the next episode preview at the end.]]
* ExhaustedEyeBags: Happens to Shougo in episode 5 due to his "sister" calling him almost every day at 6am. Both Konoe and Miyabi notice he's tired, and do various things to try and wake him up.
* {{Expy}}: [[spoiler:Yuzurina]] looks VERY similar to Toki of ''Anime/SakiAchigaHen''. They even share the [[Creator/YuiOgura same voice actress]].
* EyeCatch: It features a toy dispenser which pops out a SuperDeformed version of one of the main girls in the series. [[spoiler: Episode 9 adds a new girl, Yuzurina Houshou, who ''also'' claims to be Shougo's little sister.]]
* FacePalm: Shougo does one in episode 9 after Yuzurina asks him which girl he's going to bring to the party his mother Kanoko is inviting him to. Naturally she brings it up when all of the main girls are with him, so they fight amongst themselves as to which one he's bringing.
* FanService: Quite a bit of it, since it's a {{Harem|Genre}} show. Pretty blatant in the opening intro song.
* FantasticArousal: Konoe's ''artificial'' tail is rather.. sensitive.
* FirstGirlWins: [[spoiler:Shougo eventually chooses Konoe, the first girl he met at his new school, in the later novels.]]
* ForgottenChildhoodFriend: [[spoiler:Konoe AND Miyabi. Justified, as he got hit by a car saving Konoe, which caused his memory loss, as well as strife between their fathers, which caused them to not be able to see each other again for a while. Then while recovering at the hospital, he met Miyabi there while Kazuma was getting check ups, until he no longer needed them, and they were separated again until high school.]]
* FriendlyTickleTorture: In episode 9 after Shougo eats dinner Konoe makes for him, she says she's dessert and won't leave his bed until he "eats" her. He then starts to tickler her in an attempt to get her off his bed.
* GeckoEnding: The anime stops early with [[spoiler:Miyabi]] as Shougo's sister due to the novels still ongoing at the time.
* GenkiGirl: Mana Tendou, the student council president.
* GenreSavvy: Played straight at first with Miyabi. When Konoe pretends to be Shougo's little sister helping him to change clothing, Miyabi calls her out on it, saying that only in a fantasy world would any guy be turned on by his sister helping him with changing clothing. Then she hilariously subverts it with an ImagineSpot of finding his boxers and wearing them to sleep. Shougo is understandably not too impressed by either girl's moves on him.
* GettingCrapPastTheRadar: When Rinka and Shougo are at the amusement park, they enter a dark ride and Rinka gets blasted by liquid in a manner consistent with a girl who just had sex.
* TheGlomp: Mana does this to Shougo after he's done dancing with Rinka and it doesn't end well for them. Miyabi does them in later episodes as well.
* HotForTeacher: One of the male students, Tanaka has shown to have an obvious crush on his teacher Kotori-sensei. Which every time he vocalizes it, causes her to hit him with something.
* IfItsYouItsOkay: When Shougo asks for a DNA sample from Konoe's "mucus membrane" in episode 7, she's hesitant at first, but eventually relents, saying this. She then bends down and proceeds to drop her underwear, prompting Shougo to clarify that he just needed it from the inside of her cheek. Cue Konoe's face turning [[LuminescentBlush beet red]].
* ImagineSpot: Shougo has one in episode 5 about marrying Konoe.
* IncestantAdmirer: Shougo's sister, made even worse by the fact that he doesn't know who she is.
* InformedAbility: The School President is been said to be serious when it comes to her work but will act childishly when having fun. So far every time she is on screen she is just acting childishly. (Thankfully, her serious side is only mentioned the first time she appears, so it might have been the writers' initial intentions and remained in the script by accident.)
* InkSuitActor: A coincidental example. Konoe resembles her voice actresses Creator/KaoriIshihara and Creator/MonicaRial, while Rinka resembles her English voice actress Creator/MaggieFlecknoe.
* InnocentFanserviceGirl: Mizutani is unaware of how babies are made, and after Shougo hands her a pamphlet on how it's done, she immediately wants to "practice" it with him. Then Miyabi and Konoe walk in on them as Mizutani is on top of him in bed. She cranks it UpToEleven in episode 7, stretching out while wearing nothing but a towel around her shoulders. While Shougo is still uncomfortable around it, he seems to less offended by than he originally was.
** ShamelessFanserviceGirl: Konoe and Miyabi do this occasionally, fully intending to seduce Shougo.
* InSeriesNickname: Shougo is called "Onii-chan senpai" [[note]]"Onii-chan" means big brother in Japanese, "Senpai" is an honorific lower grade students, such as freshmen, use for higher grade ones like seniors[[/note]] by the freshmen girls in episode 6.
* InsultBackfire: In episode 3, while both Miyabi and Konoe are pulling the "little sister" act, he begs Mizutani for help. Both girls reject it, claiming that if Shougo looks at Mizutani, he'll get "him" pregnant. Mizutani says that "he" wouldn't mind that, to the shock of both girls, who then drag him out of the classroom.
* LittleSisterHeroine: Deconstructed; Shougo wants to get to know his sister (and protect her from his disapproving family) but not in ''that'' way.
* LoveConfession: [[spoiler: Rinka does this to Shougo (naked, too) when she wants to have a real relationship rather than the fake one so she could get out of an ArrangedMarriage.]]
* LoveHurts: Miyabi doesn't seem very happy in episode 9 [[spoiler: when she sees Shougo about to kiss Konoe.]]
* LoverTugOfWar: Miyabi and Konoe do this to a SuperDeformed Shougo during the opening credits.
* LoveTriangle: While there are other girls, so far the main focus is between Konoe and Miyabi toward Shougo. Both girls refuse to back down in their attempts to win his affections.
* LuminescentBlush: When Shougo asks for a DNA sample from Konoe's "mucus membrane" in episode 7, she's hesitant at first, but eventually relents, saying IfItsYouItsOkay. She then bends down and proceeds to drop her underwear, prompting Shougo to clarify that he just needed it from the inside of her cheek. Cue Konoe's face turning beet red.
* MaleGaze: Used quite a bit in the series.
* ManipulativeBastard: [[spoiler: Yuzurina aka Denno Nayuri, although being an actress, she puts on a largely good act until things start to unravel around episodes 11 & 12.]]
* MistakenForGay: Shougo in episode 3 when Miyabi and Konoe both walk in on his apartment while Mizutani is on top of him in bed. They go to ridiculous lengths to make sure he likes women, such as waking him up in bed, making him food, and later, taking a bath in his apartment, as well as snuggling up to him. The girls accuse them of this again in episode 12.
* ModestyShorts: Miyabi.
* MomentKiller: Miyabi spots Konoe and Shougo sitting on a bench together at the end of episode 4 in the park, right as it seemed the two were going to kiss. She then goes into ClingyJealousGirl mode, and wonders why Shougo had her running around looking for Konoe, just to find them spending time alone together. She also accuses Konoe of cheating to try and get ahead of her with Shougo.
** Mizutani calls Shougo in episode 6 just as Mei was beginning to slowly undress herself in front of him to ask him to look for her hat which she forgot at the cafe earlier. He doesn't find it, but it stops Mei from attempting her advances on him, [[spoiler: and it turns out Mizutani had her hat, and simply called him to interrupt what Mei was doing. Shougo then wonders if Mizutani had cameras spying on him in there, to which she neither confirms nor denies.]]
** Shiga walks into the student council office in episode 8, [[spoiler: just as Rinka was nearly naked and on top of Shougo, and was suggesting they become real lovers.]]
** When Shougo was [[AlmostKiss about to kiss]] Konoe in episode 9, [[spoiler: Miyabi just happened to be walking within the vicinity. She doesn't say anything and hides immediately, but it was enough to stop them from kissing when Shougo thought he saw someone in the area.]]
* NakedApron: Miyabi wears one at the end of episode 4.
* NiceGuy: Shougo is one, and often does what he can to help out the girls, such as with Mei and her cafe, or Rinka with her [[spoiler:forced ArrangedMarriage]].
* NiceHat: Mizutani often wears one. In fact, it's her trademark when she's in disguise. Mei wears a nice witch hat all the time.
* NewTransferStudent: Happens first to Shougo, then Mizutani. One of the students asks [[GenreSavvy why their class suddenly got two new students]].
* NoGuyWantsToBeChased: Particularly as one of the girls chasing him claims to be his biological sister. But Konoe and Miyabi both tend to go overboard in their attempts to woo him.
* NoseBleed: [[spoiler: Yuzurina suffers one in episode 9 when she thinks Konoe and Shougo are doing naughty things in his room.]]
* NotWhatItLooksLike: When Miyabi and Konoe open Shougo's door to walk with him to school, and sees Mizutani on top of Shougo.
** At the same time, it is also ''exactly'' what it looks like.
* NumberTwo: Rinka to Mana in the student council.
* OlderThanTheyLook: Kotori-sensei, who looks younger than her students.
** Miyabi as well. She is Shougo's age, but looks a lot younger, mainly because of her height and hairstyle.
* OnOneCondition: A substantial part of the premise.
* ParentalAbandonment: Miyabi reveals to Shougo in episode 12 that her mother left her and is only seen rarely nowadays. [[spoiler: Also played straight with Kazuma, which from the FlashBack of Miyabi's childhood, shows that her mother didn't want anything to do with him, even going so far as to not spend the money he gave to help raise Miyabi.]]
* PetitePride: Miyabi, after she concludes that maybe Shougo would rather see small breasts like hers rather than big ones like Konoe's.
* ThePlan: In episode 5, after the previous episode established [[spoiler: that Shougo's calls from his little sister are actually from Konoe]], he receives more calls everyday at 6am from a girl claiming to be his sister. As a result, he was tired at school, and took naps in Mei's secret room at school, and also learned more about Mei's cafe shop and how it used to belong to her mother. Then he learns from one of the girls working there that Mei was selling it and moving to America, so he confronts her about it in episode 6.
** Turns out that Mei's shop was just barely scraping by, so Shougo decided to help her pick up some business. And does a fairly good job at that. Then Mei starts hitting on him rather aggressively, suggesting they get married and have a "superior" kid with both good business and {{Moe}} traits, which understandably turns him off, as he suspected Mei may be his sister after all.
*** But in reality, [[spoiler: Mei was merely pretending to be his sister, and when he turned her down, she would then use her failing business as a pretext for leaving. But then he threw a SpannerInTheWorks by turning the business around. Turns out that Mei knows his sister's identity, as they played together as kids, and Mei put on the act to prevent Shougo from finding out who she really was, to avoid the scrutiny, public scorn, and shame that the Mikadono group would no doubt heap on his father's illegitimate child once her identity became public. So she initially refuses to tell him his sister's identity. But Shougo insists on knowing, so that he can acknowledge her as his sister, as well as protect her. Mei is still cautious about it, so she wants to make sure Shougo can back those words up first.]]
* PleaseDontLeaveMe: Miyabi gives a TearJerker plea to Shougo in episode 10, [[spoiler: while naked and on top of him no less.]]
* PlotTriggeringDeath: Kumagoro's death is what kick-starts the plot.
* ProperTightsWithASkirt: Mei wears this with her school uniform.
* RapunzelHair: Konoe's long hair reaches past her buttocks.
* RedHerring: Apparently nothing [[spoiler:before episode 9]] had anything to do with Shougo's mysterious little sister.
** Another large one occurs in episode 10 [[spoiler: regarding the DNA test. Although it says he's blood related to Yuzurina, later in the episode Yuzurina is wondering if Mei and Miyabi are good friends since Mei seemed really worried about Shougo taking advantage of the girl while she was passed out. Then Shougo begins wondering when Mei and Miyabi became really good friends. See ThePlan for more information.]]
* RelatedInTheAdaptation: In the light novels, it turns out t[[spoiler:Miyabi isn't Shougo's younger sister]]. The anime version, on the other hand...
* RelationshipUpgrade: [[spoiler: Invoked at the end of episode 8, with Shougo suggesting it to help Rinka break off her engagement with one of her family's business partner's son. Although he only meant to pretend it so that she would then be free from the engagement, and therefore able to choose whoever she wants, Rinka is more than happy to apply the trope to them, and takes off most of her clothing so they can become "real" lovers, instead of just pretend ones. Later, she brings him a huge lunch, and says that her father Genda approves of him dating her, as well as an eventual marriage, much to his shock.]] Cue an [[ClingyJealousGirl enraged Konoe and Miyabi]] who demand to know what exactly happened, as the camera pans up while Shougo screams.
* TheReveal: In episode 4, [[spoiler:after Shougo tells Konoe about what happened between him and Miyabi from episode 3, [[MyGodWhatHaveIDone she realizes she went too far]] with the little sister phone calls. She then tells Shougo that she's not his sister, and knew him from childhood, and he saved her from getting hit by a car, hence the injury to his forehead. While Shougo is glad that the phone calls weren't from his actual sister, he still wonders who showed up at Kumagoro's funeral that day.]]
** Miyabi also delivers one to him shortly after. [[spoiler:She played with him at the hospital when Kazuma was getting check ups, fell in love with him there, and they often pretended to be married. So when he transferred to her school, she was happy to see him again.]]
** Mei gives one to Shougo in episode 6, after he finds out certain things. See ThePlan.
* ScarsAreForever: Shougo has one on his forehead. Apparently, he got it after he was hit by a car when he was younger.
* SchmuckBait: When Shougo's "sister" calls him in episode 3, she tells him that she'll reveal who she is if he says that he'll marry her ten times. When he refuses, she says "I love my little sister" ten times would suffice. Cue an initial refusal from Shougo, who gets a disgusted face, then does it, after which the girl says she's going to have sweet dreams now and then hangs up on him.
* SecretKeeper: Mei had intended to keep one from Shougo, for good reason. See ThePlan.
** Shougo asks all of the main girls this in episode 9 [[spoiler: to keep his sister's identity a secret after she reveals herself. Or so he thought.]]
** Miyabi has one as well, which she tells Shougo about in episode 12, [[spoiler: that she's his real sister, and wanted to tell him but got nervous about it. It wasn't until Yuzurina showed up which then forced her to play her hand in revealing it.]]
* SenseiChan: Maiko Kotori, Shougo's homeroom teacher who looks and sometimes acts like she's younger than the rest of the girls.
* SexyDiscretionShot: Used quite heavily with Mizutani, since she likes to exercise in Shougo's apartment naked. Although, most of it's uncensored in the DVD version.
* ShoutOut:
** [[http://img811.imageshack.us/img811/8509/appearanceinkononakanih.png Look!]] [[http://img94.imageshack.us/img94/8509/appearanceinkononakanih.png It's]] [[Series/HikoninSentaiAkibaranger Nobuo Akagi!]]
** When Kotori throws chalk at Tanaka during her lecture, she yells, "[[Anime/{{Yatterman}} Sukapontan]]!"
* SkinshipGrope: Miyabi grabs Konoe's breasts at the pool in episode 9 after the two girls exchange insults regarding their bodies and the way it affects their swimming.
* SmarterThanYouLook: Shougo, despite being depicted as a normal high school student, he has been able to deduce many things on very little evidences and comments he hears.
* {{Squee}}: Random high school girls do this in episode 6 when Shougo and Mizutani both dress up like butlers and are serving/taking pictures with them.
* StalkerWithACrush: Shougo hears a girl's voice in the first episode who claims to be his long lost sister. She proclaims that she's going to marry him, and will usually call him and tell him she saw what he was doing earlier that day/episode.
** He hilariously wants this trope to be invoked in episode 3 when both Miyabi and Konoe are sleeping next to him in his bed, to confirm that one of them (or neither one) would be his sister, but unfortunately for him, she doesn't call that day.
* SweetPollyOliver: Ikusu Mizutani, aka Mister X. Revealed within minutes in the same episode (as well as [[SpoilerOpening the opening]]), and Shougo initially thought she really was a man during their first encounter. She claims to be doing this under the guise of discovering which girl is his sister at the school, but Shougo wonders about her tactics at times.
* SuperDeformed: The girls during the EyeCatch scenes, and the ending.
* StudentCouncilPresident: Mana Tendou. Rinka Kunitachi is the Vice President, despite being a first year.
* TeacherStudentRomance: Tanaka for Kotori-sensei
* ThanksForTheMammaries: Shougo does this accidentally to Rinka in episode 2 after Mana accidentally knocks them over.
** He does it again in episode 8, although this time it was due to the ride they were in losing power and everything going black, as well as Rinka panicking during the blackout.
* TheComicallySerious: Usually Rinka, but she's NotSoAboveItAll on the [[Main.OnTheNext next episode previews]] where we clearly see her chasing a butterfly.
* TheOjou: Since this school is for rich kids, most likely every girl is one, but especially Rinka.
%% Administrivia/ZeroContextExample * ThirdOptionLoveInterest: Rinka
* ThroughHisStomach: Several of the girls utilize this trope, but Konoe is probably the biggest user of this.
* TomboyAndGirlyGirl: Miyabi's Tomboy to Konoe's Girly Girl.
* {{Troll}}: [[spoiler: Turns out that in the early episodes, the girl claiming to be Shougo's sister was actually just Konoe screwing with him. And she seemed to really be enjoying it, up until he suspected that Miyabi was the one calling him and was in fact his sister, which caused her to then go into a MyGodWhatHaveIDone moment.]]
* {{Tsundere}}: Miyabi. Surprisingly she shows more of a Type B "deredere" than Type A "Tsuntsun" toward him after their initial meeting.
** Rinka as well. When she wonders if she really acts like this, both Mana and Shougo give her a weird stare.
* UnwantedAssistance: Shougo runs away from Miyabi and Konoe in episode 3 due to their insistence on "training him to like girls".
* UnwantedHarem: Largely thanks to the fact that the girls at his school know his last name, and that he's the son of the successful business owner who died recently. And also because he's a genuinely NiceGuy.
* WackyMarriageProposal: Mizutani suggests this to Shougo as a means to resolve his issue of not knowing which girl is his sister. He immediately rejects the idea.
* WhamEpisode: A few examples:
** Episode 3, [[spoiler: when Shougo strongly suspects that Miyabi may be his sister.]]
** Episode 6, [[spoiler: When Mei reveals an even bigger bombshell, that she knows who his sister is, and deliberately pretended to be her, so as to keep him from knowing her true identity. See ThePlan for further details.]]
** Episode 9, [[spoiler: where a new girl named Yuzurina Houshou (the girl with the board of directors during the school inspection in Episode 7) claims to be Shougo's little sister and moves to a room next to his. The rest of the girls are understandably shocked about this and they demand that the two take a DNA test to confirm her confession. The DNA test confirms it.]]
** Episode 12, [[spoiler:Yuzurina isn't his sister, it's Miyabi!]]
* ZettaiRyouiki: Konoe Tsuruma in her school uniform and the maid uniform.
----
[[OnOneCondition In accordance with his father Kumagoro's will]], Shougo Mikadono transfers to the school that his future wife is said to be attending. But also attending the school is Shougo's younger sister, who was separated from him at birth, and he doesn't know what she looks like - but she attempts to [[StalkerWithACrush get close to him without revealing who she is]]! Can Shougo figure out which of the girls at this school is his sister and find his destined life partner at the same time?
This work shares similarities with ''VisualNovel/PrincessLover'' and ''LightNovel/{{Oreimo}}''.
Viewers in the United States can watch the anime legally at Crunchyroll under the name ''[[http://www.crunchyroll.com/nakaimo-my-sister-is-among-them Nakaimo - My Sister is Among Them!]]''. Sentai Filmworks released the series on DVD as ''NAKAIMO - My Little Sister is Among Them!'', and has put the series up for legal streaming on The Anime Network under that title.
----
!!This light novel series provides examples of:
* AboveTheInfluence: But just barely for Shougo. In episode 3, both Miyabi and Konoe feed him various supplements to boost his virility, then they spend the night with him in his bed, to "train" him to only like girls after mistaking him for being HoYay with Mizutani.
* AbsurdlyPowerfulStudentCouncil: Rinka cracks down on things she deems immoral after Shougo's sister makes an announcement over the school's public announcement system, while some prominent business officials were visiting. She also makes him the morality officer, although he doesn't seem to be doing the job very well considering the girls are wooing over him still. And it later turns out that Rinka was responsible for the announcement.
* AccidentalPervert: Shougo is prone to these due to all of the teasing the girls like to do to him, such as when Miyabi intentionally lifts her skirt up in episode 8, then a gust of wind blows through the area.
* ACupAngst: Miyabi. Other times she acts with PetitePride.
* ADateWithRosiePalms: Implied to be done by Shougo in episode 5 when his sister calls him and tells him that he shouldn't be staying up so late doing such naughty things. He doesn't outright deny it, saying he doesn't do that every night. And in the beginning of episode 9, he seems to be doing this, until the camera pans out to reveal his entire body, and shows that he was simply exercising on his bed despite his suggestive grunting.
* ADayInTheLimeLight: Every girl gets at least one episode that largely centers on them.
* AlmostKiss: Shougo and Konoe nearly kiss in the first episode, but he pulls away at the last second.
* ArrangedMarriage: [[spoiler: Rinka is stuck in one, and doesn't seem very happy about it, as she's not interested in the guy her family set her up with but can't go against it because it's for business purposes.]]
* BalancedHarem: So far Shougo doesn't seem devoted to one particular girl, but Konoe and Miyabi seem to have a slight lead over the rest.
* BalloonBelly: Mana looks visibly pregnant in Episode 10 after pigging out at the Mikadono group party.
* BarbieDollAnatomy: Happens briefly to Miyabi in episode 10 shortly after she's done taking a shower.
* BigBrotherAttraction: See BrotherSisterIncest. The first years have also all taken to calling Shougo "Onii-san sempai".
* BigEater: Mana can put away quite a bit of food.
* BishieSparkle: Mizutani has this around her when she's walking home with Shougo in episode 2. Since she's supposed to be a guy, the fact that she was clinging to his arm the entire way home made some of the students suspect they were [[HoYay gay]].
* BlackMail: Shougo's sister in episode 7 makes a broadcast over the school's PA system telling him not to find out who she is, or she's going to reveal secrets which she says are best left undiscovered.
** [[spoiler:Only it wasn't directed at Shougo but at Genda, the head of the board of directors, as Rinka tells him in episode 8.]]
* BrotherSisterIncest: Shougo's sister seems intent on doing this with him, much to his disgust.
* ButtMonkey: Tanaka's never safe from being knocked down by Kotori.
* [[CantHoldHisLiquor Cant Hold Her Liquor]]: Miyabi gets drunk after one glass of wine in episode 10, which she mistook for grape juice. According to Sagara, she took it in one gulp.
* {{Catgirl}}: The [[OnTheNext next-episode trailer]] at the end of each episode has the main girls as [[SuperDeformed super deformed]] catgirl versions of themselves.
** The title of episode 6, "Cat-ear Maid Sisters", is self-explanatory. Konoe and Mei spend most of the episode wearing electronic ears and tails that [[http://www.neurosky.com/Necomimi/ respond]] to [[http://en.rocketnews24.com/2012/06/02/japan-develops-pulse-controlled-cat-tail-accessory-that-sways-back-and-forth-when-you-get-excited/ emotions]].
* CensorSteam: Rather than steam however, they darken the areas where Konoe's skirt lifts up in the broadcast version of episode 6
* ChekhovsGun: A subtle one, but [[spoiler: In episode 1, while hanging out at the park with Konoe, Shougo is introduced to the clock and the distinct music it plays every half hour. This is what helps him find Konoe when she goes missing in episode 4, as it plays in the background when she calls him to say goodbye.]]
** Its used again in episode 5 and 6, [[spoiler: when Shougo spots Mei's phone which is exactly the same as Konoe's. Except in her case, she was pretending to be his sister to protect his true sister's identity from him, so as to avoid scrutiny and shame for being Shougo's illegitimate sister by their father's company and family.]]
* ChildhoodMarriagePromise: [[spoiler:Shougo did this with Miyabi when they were kids in the hospital, and she's held him to that promise ever since he transferred to her school. Cue shocked reaction from both Shougo and Konoe.]]
* ClingyJealousGirl: After seeing Mizutani getting a bit [[HoYay too friendly with Shougo]] in episode 3, both Miyabi and Konoe both go to great lengths to make sure he's [[MistakenForGay not batting for the other team]]. He ends up running away from both of them at school as a result of this, and they both invoke this trope again when they accuse each other of trying to get ahead with him in a relationship.
** Both girls display this trope again at the end of episode 4, and agree to pursue Shougo fairly this time around, much to his chagrin. Cue more FanService as both of them again wake him up wearing little clothing...
** Every single one of the main girls in episode 9 [[spoiler: once they find out that Yuzurina is his sister,]] and all of them make claims as to why they should be taken to the social party that his mom set up for him, and tells him to bring a date.
** [[spoiler: And even Yuzurina isn't above this trope in episode 9, as she spots one of Mizutani's hairs on his floor, then sniffs his bed to find the scent of a woman on it. Later, she listens in on Konoe's FantasticArousal and slams the wall when she thinks they're taking it too far.]]
* {{Cloudcuckoolander}}: Mana Tendou tends to have these moments, much to Rinka's chagrin.
* CloudcuckoolandersMinder: Rinka for Mana.
* ContrivedCoincidence: It sure seems strange [[spoiler:that all of the calls Shougo receives from "his sister" all manage to sound exactly the same. While it could be accounted for by the the phone's voice changing ability (and is based on Yuzurina's voice in the anime), what's unusual is that they sound exactly like the girl from the beginning, who never phoned Shougo in that manner in the first place, and none of the other girls were present during that moment.]]
* CovertPervert: ''Everyone'' has varying shades of this. Yes, even [[Main.NiceGuy Shougo Mikadono]], [[Main.NiceGirl Konoe Tsuruma]], and [[Main.TheComicallySerious Rinka Kunitachi]]. [[spoiler: Looks like Yuzurina Houshou, the latest girl who claims to be Shougo's little sister, has shades of this too.]]
* CreditsRunningSequence: One happens in the closing credits with Shougo attempting to run away from the main girls in the show.
* CringeComedy: Though still quite sentimental and heartwarming in spite of it all.
* CuteLittleFang: Miyabi has one, but is only shown when she opens her mouth wide.
* CuteWitch: Mei Sagara dresses up like one as part of her standard outfit. She even dresses as one in episode 10 during the formal event.
* DangerouslyShortSkirt: Standard part of the uniform for the girls.
* DeclarationOfProtection:
** Shougo invokes this in episode 6, [[spoiler: when he tells Mei that he wants to know who his sister is in order to protect her and acknowledge her as his sister.]]
** He does this again in episode 8, [[spoiler: after Rinka tells him about her ArrangedMarriage, which she doesn't want, because she believes in marrying for love. He suggests that they pretend to be lovers so that her family would be forced to break off her engagement, and can then choose whoever she wants to really marry. Unfortunately for him, she doesn't want to pretend...]]
* DistractedByTheSexy: Miyabi deliberately invokes this in episode 8, when she arrives at school wearing a skirt that seems a bit too short, and forces Shougo to measure it. But she keeps teasing him and asking if he wants to look up her skirt, to which he hesitantly says no. Konoe then arrives, and demands he measure her skirt as well. [[spoiler: Then a wind gust blows through, and both girl's skirts are lifted. Shougo claims he didn't see anything, but then he mentions Miyabi wearing shorts, which angers her because that meant he looked up her skirt when the wind blew.]]
* DoesThisRemindYouOfAnything: When Konoe is cosplaying as a cat maid in episode 6, her tail is acting erratically, and Shougo tries to help her with it. But as he rubs and pulls on the tail, Konoe seems a bit too excited by it. Oh, and Episode 9 too, where Shougo and Konoe make weird sounds during the beginning [[spoiler: when Shougo was exercising]] and near the end of the second half [[spoiler: where Shougo [[Main.ItMakesSenseInContext tickles Konoe unless she leaves his bed]]]].
* DoubleStandardAbuseFemaleOnMale: Despite it being a total accident thanks to Mana, Shougo gets a roundhouse kick to his head from Rinka in episode 2 and again in episode 8 only he gets slapped instead.
** Both Shougo and Tanaka get hit by Kotori-sensei's swimming board in episode 9.
* EarlyBirdCameo: [[spoiler: Yuzurina can be seen with the board of directors visiting the school in episode 7, but we're not given any indications that its her other than a subtle smile towards him. It's also unusual that her hair is black in that episode, but then is brown in episode 9 when she reveals herself to him. Although it could be that she was trying not to seem too obvious to him and [[FridgeLogic simply dyed her hair]] at the time.]]
* EarnYourHappyEnding: In the novels, [[spoiler:it turns out that Miyabi is his cousin and Konoe was the illegitimate daughter, but they later discover that she's not blood related to Shougo (since Shougo isn't blood-related to his father Kumagoro). Miyabi's father Kazuma marries Kanoko, Miyabi becomes Shougo's step-sister and Konoe as his lover.]]
* EvolvingCredits: [[spoiler: After episode nine, Yuzurina replaces Shougo's sister's silhouette during the opening credits. She is also among the girls during the next episode preview at the end.]]
* ExhaustedEyeBags: Happens to Shougo in episode 5 due to his "sister" calling him almost every day at 6am. Both Konoe and Miyabi notice he's tired, and do various things to try and wake him up.
* {{Expy}}: [[spoiler:Yuzurina]] looks VERY similar to Toki of ''Anime/SakiAchigaHen''. They even share the [[Creator/YuiOgura same voice actress]].
* EyeCatch: It features a toy dispenser which pops out a SuperDeformed version of one of the main girls in the series. [[spoiler: Episode 9 adds a new girl, Yuzurina Houshou, who ''also'' claims to be Shougo's little sister.]]
* FacePalm: Shougo does one in episode 9 after Yuzurina asks him which girl he's going to bring to the party his mother Kanoko is inviting him to. Naturally she brings it up when all of the main girls are with him, so they fight amongst themselves as to which one he's bringing.
* FanService: Quite a bit of it, since it's a {{Harem|Genre}} show. Pretty blatant in the opening intro song.
* FantasticArousal: Konoe's ''artificial'' tail is rather.. sensitive.
* FirstGirlWins: [[spoiler:Shougo eventually chooses Konoe, the first girl he met at his new school, in the later novels.]]
* ForgottenChildhoodFriend: [[spoiler:Konoe AND Miyabi. Justified, as he got hit by a car saving Konoe, which caused his memory loss, as well as strife between their fathers, which caused them to not be able to see each other again for a while. Then while recovering at the hospital, he met Miyabi there while Kazuma was getting check ups, until he no longer needed them, and they were separated again until high school.]]
* FriendlyTickleTorture: In episode 9 after Shougo eats dinner Konoe makes for him, she says she's dessert and won't leave his bed until he "eats" her. He then starts to tickler her in an attempt to get her off his bed.
* GeckoEnding: The anime stops early with [[spoiler:Miyabi]] as Shougo's sister due to the novels still ongoing at the time.
* GenkiGirl: Mana Tendou, the student council president.
* GenreSavvy: Played straight at first with Miyabi. When Konoe pretends to be Shougo's little sister helping him to change clothing, Miyabi calls her out on it, saying that only in a fantasy world would any guy be turned on by his sister helping him with changing clothing. Then she hilariously subverts it with an ImagineSpot of finding his boxers and wearing them to sleep. Shougo is understandably not too impressed by either girl's moves on him.
* GettingCrapPastTheRadar: When Rinka and Shougo are at the amusement park, they enter a dark ride and Rinka gets blasted by liquid in a manner consistent with a girl who just had sex.
* TheGlomp: Mana does this to Shougo after he's done dancing with Rinka and it doesn't end well for them. Miyabi does them in later episodes as well.
* HotForTeacher: One of the male students, Tanaka has shown to have an obvious crush on his teacher Kotori-sensei. Which every time he vocalizes it, causes her to hit him with something.
* IfItsYouItsOkay: When Shougo asks for a DNA sample from Konoe's "mucus membrane" in episode 7, she's hesitant at first, but eventually relents, saying this. She then bends down and proceeds to drop her underwear, prompting Shougo to clarify that he just needed it from the inside of her cheek. Cue Konoe's face turning [[LuminescentBlush beet red]].
* ImagineSpot: Shougo has one in episode 5 about marrying Konoe.
* IncestantAdmirer: Shougo's sister, made even worse by the fact that he doesn't know who she is.
* InformedAbility: The School President is been said to be serious when it comes to her work but will act childishly when having fun. So far every time she is on screen she is just acting childishly. (Thankfully, her serious side is only mentioned the first time she appears, so it might have been the writers' initial intentions and remained in the script by accident.)
* InkSuitActor: A coincidental example. Konoe resembles her voice actresses Creator/KaoriIshihara and Creator/MonicaRial, while Rinka resembles her English voice actress Creator/MaggieFlecknoe.
* InnocentFanserviceGirl: Mizutani is unaware of how babies are made, and after Shougo hands her a pamphlet on how it's done, she immediately wants to "practice" it with him. Then Miyabi and Konoe walk in on them as Mizutani is on top of him in bed. She cranks it UpToEleven in episode 7, stretching out while wearing nothing but a towel around her shoulders. While Shougo is still uncomfortable around it, he seems to less offended by than he originally was.
** ShamelessFanserviceGirl: Konoe and Miyabi do this occasionally, fully intending to seduce Shougo.
* InSeriesNickname: Shougo is called "Onii-chan senpai" [[note]]"Onii-chan" means big brother in Japanese, "Senpai" is an honorific lower grade students, such as freshmen, use for higher grade ones like seniors[[/note]] by the freshmen girls in episode 6.
* InsultBackfire: In episode 3, while both Miyabi and Konoe are pulling the "little sister" act, he begs Mizutani for help. Both girls reject it, claiming that if Shougo looks at Mizutani, he'll get "him" pregnant. Mizutani says that "he" wouldn't mind that, to the shock of both girls, who then drag him out of the classroom.
* LittleSisterHeroine: Deconstructed; Shougo wants to get to know his sister (and protect her from his disapproving family) but not in ''that'' way.
* LoveConfession: [[spoiler: Rinka does this to Shougo (naked, too) when she wants to have a real relationship rather than the fake one so she could get out of an ArrangedMarriage.]]
* LoveHurts: Miyabi doesn't seem very happy in episode 9 [[spoiler: when she sees Shougo about to kiss Konoe.]]
* LoverTugOfWar: Miyabi and Konoe do this to a SuperDeformed Shougo during the opening credits.
* LoveTriangle: While there are other girls, so far the main focus is between Konoe and Miyabi toward Shougo. Both girls refuse to back down in their attempts to win his affections.
* LuminescentBlush: When Shougo asks for a DNA sample from Konoe's "mucus membrane" in episode 7, she's hesitant at first, but eventually relents, saying IfItsYouItsOkay. She then bends down and proceeds to drop her underwear, prompting Shougo to clarify that he just needed it from the inside of her cheek. Cue Konoe's face turning beet red.
* MaleGaze: Used quite a bit in the series.
* ManipulativeBastard: [[spoiler: Yuzurina aka Denno Nayuri, although being an actress, she puts on a largely good act until things start to unravel around episodes 11 & 12.]]
* MistakenForGay: Shougo in episode 3 when Miyabi and Konoe both walk in on his apartment while Mizutani is on top of him in bed. They go to ridiculous lengths to make sure he likes women, such as waking him up in bed, making him food, and later, taking a bath in his apartment, as well as snuggling up to him. The girls accuse them of this again in episode 12.
* ModestyShorts: Miyabi.
* MomentKiller: Miyabi spots Konoe and Shougo sitting on a bench together at the end of episode 4 in the park, right as it seemed the two were going to kiss. She then goes into ClingyJealousGirl mode, and wonders why Shougo had her running around looking for Konoe, just to find them spending time alone together. She also accuses Konoe of cheating to try and get ahead of her with Shougo.
** Mizutani calls Shougo in episode 6 just as Mei was beginning to slowly undress herself in front of him to ask him to look for her hat which she forgot at the cafe earlier. He doesn't find it, but it stops Mei from attempting her advances on him, [[spoiler: and it turns out Mizutani had her hat, and simply called him to interrupt what Mei was doing. Shougo then wonders if Mizutani had cameras spying on him in there, to which she neither confirms nor denies.]]
** Shiga walks into the student council office in episode 8, [[spoiler: just as Rinka was nearly naked and on top of Shougo, and was suggesting they become real lovers.]]
** When Shougo was [[AlmostKiss about to kiss]] Konoe in episode 9, [[spoiler: Miyabi just happened to be walking within the vicinity. She doesn't say anything and hides immediately, but it was enough to stop them from kissing when Shougo thought he saw someone in the area.]]
* NakedApron: Miyabi wears one at the end of episode 4.
* NiceGuy: Shougo is one, and often does what he can to help out the girls, such as with Mei and her cafe, or Rinka with her [[spoiler:forced ArrangedMarriage]].
* NiceHat: Mizutani often wears one. In fact, it's her trademark when she's in disguise. Mei wears a nice witch hat all the time.
* NewTransferStudent: Happens first to Shougo, then Mizutani. One of the students asks [[GenreSavvy why their class suddenly got two new students]].
* NoGuyWantsToBeChased: Particularly as one of the girls chasing him claims to be his biological sister. But Konoe and Miyabi both tend to go overboard in their attempts to woo him.
* NoseBleed: [[spoiler: Yuzurina suffers one in episode 9 when she thinks Konoe and Shougo are doing naughty things in his room.]]
* NotWhatItLooksLike: When Miyabi and Konoe open Shougo's door to walk with him to school, and sees Mizutani on top of Shougo.
** At the same time, it is also ''exactly'' what it looks like.
* NumberTwo: Rinka to Mana in the student council.
* OlderThanTheyLook: Kotori-sensei, who looks younger than her students.
** Miyabi as well. She is Shougo's age, but looks a lot younger, mainly because of her height and hairstyle.
* OnOneCondition: A substantial part of the premise.
* ParentalAbandonment: Miyabi reveals to Shougo in episode 12 that her mother left her and is only seen rarely nowadays. [[spoiler: Also played straight with Kazuma, which from the FlashBack of Miyabi's childhood, shows that her mother didn't want anything to do with him, even going so far as to not spend the money he gave to help raise Miyabi.]]
* PetitePride: Miyabi, after she concludes that maybe Shougo would rather see small breasts like hers rather than big ones like Konoe's.
* ThePlan: In episode 5, after the previous episode established [[spoiler: that Shougo's calls from his little sister are actually from Konoe]], he receives more calls everyday at 6am from a girl claiming to be his sister. As a result, he was tired at school, and took naps in Mei's secret room at school, and also learned more about Mei's cafe shop and how it used to belong to her mother. Then he learns from one of the girls working there that Mei was selling it and moving to America, so he confronts her about it in episode 6.
** Turns out that Mei's shop was just barely scraping by, so Shougo decided to help her pick up some business. And does a fairly good job at that. Then Mei starts hitting on him rather aggressively, suggesting they get married and have a "superior" kid with both good business and {{Moe}} traits, which understandably turns him off, as he suspected Mei may be his sister after all.
*** But in reality, [[spoiler: Mei was merely pretending to be his sister, and when he turned her down, she would then use her failing business as a pretext for leaving. But then he threw a SpannerInTheWorks by turning the business around. Turns out that Mei knows his sister's identity, as they played together as kids, and Mei put on the act to prevent Shougo from finding out who she really was, to avoid the scrutiny, public scorn, and shame that the Mikadono group would no doubt heap on his father's illegitimate child once her identity became public. So she initially refuses to tell him his sister's identity. But Shougo insists on knowing, so that he can acknowledge her as his sister, as well as protect her. Mei is still cautious about it, so she wants to make sure Shougo can back those words up first.]]
* PleaseDontLeaveMe: Miyabi gives a TearJerker plea to Shougo in episode 10, [[spoiler: while naked and on top of him no less.]]
* PlotTriggeringDeath: Kumagoro's death is what kick-starts the plot.
* ProperTightsWithASkirt: Mei wears this with her school uniform.
* RapunzelHair: Konoe's long hair reaches past her buttocks.
* RedHerring: Apparently nothing [[spoiler:before episode 9]] had anything to do with Shougo's mysterious little sister.
** Another large one occurs in episode 10 [[spoiler: regarding the DNA test. Although it says he's blood related to Yuzurina, later in the episode Yuzurina is wondering if Mei and Miyabi are good friends since Mei seemed really worried about Shougo taking advantage of the girl while she was passed out. Then Shougo begins wondering when Mei and Miyabi became really good friends. See ThePlan for more information.]]
* RelatedInTheAdaptation: In the light novels, it turns out t[[spoiler:Miyabi isn't Shougo's younger sister]]. The anime version, on the other hand...
* RelationshipUpgrade: [[spoiler: Invoked at the end of episode 8, with Shougo suggesting it to help Rinka break off her engagement with one of her family's business partner's son. Although he only meant to pretend it so that she would then be free from the engagement, and therefore able to choose whoever she wants, Rinka is more than happy to apply the trope to them, and takes off most of her clothing so they can become "real" lovers, instead of just pretend ones. Later, she brings him a huge lunch, and says that her father Genda approves of him dating her, as well as an eventual marriage, much to his shock.]] Cue an [[ClingyJealousGirl enraged Konoe and Miyabi]] who demand to know what exactly happened, as the camera pans up while Shougo screams.
* TheReveal: In episode 4, [[spoiler:after Shougo tells Konoe about what happened between him and Miyabi from episode 3, [[MyGodWhatHaveIDone she realizes she went too far]] with the little sister phone calls. She then tells Shougo that she's not his sister, and knew him from childhood, and he saved her from getting hit by a car, hence the injury to his forehead. While Shougo is glad that the phone calls weren't from his actual sister, he still wonders who showed up at Kumagoro's funeral that day.]]
** Miyabi also delivers one to him shortly after. [[spoiler:She played with him at the hospital when Kazuma was getting check ups, fell in love with him there, and they often pretended to be married. So when he transferred to her school, she was happy to see him again.]]
** Mei gives one to Shougo in episode 6, after he finds out certain things. See ThePlan.
* ScarsAreForever: Shougo has one on his forehead. Apparently, he got it after he was hit by a car when he was younger.
* SchmuckBait: When Shougo's "sister" calls him in episode 3, she tells him that she'll reveal who she is if he says that he'll marry her ten times. When he refuses, she says "I love my little sister" ten times would suffice. Cue an initial refusal from Shougo, who gets a disgusted face, then does it, after which the girl says she's going to have sweet dreams now and then hangs up on him.
* SecretKeeper: Mei had intended to keep one from Shougo, for good reason. See ThePlan.
** Shougo asks all of the main girls this in episode 9 [[spoiler: to keep his sister's identity a secret after she reveals herself. Or so he thought.]]
** Miyabi has one as well, which she tells Shougo about in episode 12, [[spoiler: that she's his real sister, and wanted to tell him but got nervous about it. It wasn't until Yuzurina showed up which then forced her to play her hand in revealing it.]]
* SenseiChan: Maiko Kotori, Shougo's homeroom teacher who looks and sometimes acts like she's younger than the rest of the girls.
* SexyDiscretionShot: Used quite heavily with Mizutani, since she likes to exercise in Shougo's apartment naked. Although, most of it's uncensored in the DVD version.
* ShoutOut:
** [[http://img811.imageshack.us/img811/8509/appearanceinkononakanih.png Look!]] [[http://img94.imageshack.us/img94/8509/appearanceinkononakanih.png It's]] [[Series/HikoninSentaiAkibaranger Nobuo Akagi!]]
** When Kotori throws chalk at Tanaka during her lecture, she yells, "[[Anime/{{Yatterman}} Sukapontan]]!"
* SkinshipGrope: Miyabi grabs Konoe's breasts at the pool in episode 9 after the two girls exchange insults regarding their bodies and the way it affects their swimming.
* SmarterThanYouLook: Shougo, despite being depicted as a normal high school student, he has been able to deduce many things on very little evidences and comments he hears.
* {{Squee}}: Random high school girls do this in episode 6 when Shougo and Mizutani both dress up like butlers and are serving/taking pictures with them.
* StalkerWithACrush: Shougo hears a girl's voice in the first episode who claims to be his long lost sister. She proclaims that she's going to marry him, and will usually call him and tell him she saw what he was doing earlier that day/episode.
** He hilariously wants this trope to be invoked in episode 3 when both Miyabi and Konoe are sleeping next to him in his bed, to confirm that one of them (or neither one) would be his sister, but unfortunately for him, she doesn't call that day.
* SweetPollyOliver: Ikusu Mizutani, aka Mister X. Revealed within minutes in the same episode (as well as [[SpoilerOpening the opening]]), and Shougo initially thought she really was a man during their first encounter. She claims to be doing this under the guise of discovering which girl is his sister at the school, but Shougo wonders about her tactics at times.
* SuperDeformed: The girls during the EyeCatch scenes, and the ending.
* StudentCouncilPresident: Mana Tendou. Rinka Kunitachi is the Vice President, despite being a first year.
* TeacherStudentRomance: Tanaka for Kotori-sensei
* ThanksForTheMammaries: Shougo does this accidentally to Rinka in episode 2 after Mana accidentally knocks them over.
** He does it again in episode 8, although this time it was due to the ride they were in losing power and everything going black, as well as Rinka panicking during the blackout.
* TheComicallySerious: Usually Rinka, but she's NotSoAboveItAll on the [[Main.OnTheNext next episode previews]] where we clearly see her chasing a butterfly.
* TheOjou: Since this school is for rich kids, most likely every girl is one, but especially Rinka.
%% Administrivia/ZeroContextExample * ThirdOptionLoveInterest: Rinka
* ThroughHisStomach: Several of the girls utilize this trope, but Konoe is probably the biggest user of this.
* TomboyAndGirlyGirl: Miyabi's Tomboy to Konoe's Girly Girl.
* {{Troll}}: [[spoiler: Turns out that in the early episodes, the girl claiming to be Shougo's sister was actually just Konoe screwing with him. And she seemed to really be enjoying it, up until he suspected that Miyabi was the one calling him and was in fact his sister, which caused her to then go into a MyGodWhatHaveIDone moment.]]
* {{Tsundere}}: Miyabi. Surprisingly she shows more of a Type B "deredere" than Type A "Tsuntsun" toward him after their initial meeting.
** Rinka as well. When she wonders if she really acts like this, both Mana and Shougo give her a weird stare.
* UnwantedAssistance: Shougo runs away from Miyabi and Konoe in episode 3 due to their insistence on "training him to like girls".
* UnwantedHarem: Largely thanks to the fact that the girls at his school know his last name, and that he's the son of the successful business owner who died recently. And also because he's a genuinely NiceGuy.
* WackyMarriageProposal: Mizutani suggests this to Shougo as a means to resolve his issue of not knowing which girl is his sister. He immediately rejects the idea.
* WhamEpisode: A few examples:
** Episode 3, [[spoiler: when Shougo strongly suspects that Miyabi may be his sister.]]
** Episode 6, [[spoiler: When Mei reveals an even bigger bombshell, that she knows who his sister is, and deliberately pretended to be her, so as to keep him from knowing her true identity. See ThePlan for further details.]]
** Episode 9, [[spoiler: where a new girl named Yuzurina Houshou (the girl with the board of directors during the school inspection in Episode 7) claims to be Shougo's little sister and moves to a room next to his. The rest of the girls are understandably shocked about this and they demand that the two take a DNA test to confirm her confession. The DNA test confirms it.]]
** Episode 12, [[spoiler:Yuzurina isn't his sister, it's Miyabi!]]
* ZettaiRyouiki: Konoe Tsuruma in her school uniform and the maid uniform.
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