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''I'm a Royal Tutor in My Sister's Dress'' (Dress na Boku ga Yangotonaki Katagata no Kateikyoushi-sama na Kudan) is a light novel-turned-manga series written by Mizuki Nomura and illustrated by Karory (light novel) and Sakurana Haru (manga).

Ordinary boy Sherlock Doyle finds that his genius sister Glinda has abandoned her post as a [[PrivateTutor royal tutor]] and that unless he takes her place they could both be executed. He finds himself having to teach maths to the kings five young children, while attempting to stop anybody finding about his true gender.

!!''I'm a Royal Tutor in My Sister's Dress'' provides examples of:

* TheAce: Glinda, who has shades of being a BrokenAce as well.
* AccidentalPervert: Sherlock, in his hasty attempt to leave the castle, accidentally sees Ryuuju bathing...Then proceeds to fall into Seira's bath.
* AdorablyPrecociousChild: Shinn, the youngest prince.
* AlwaysIdenticalTwins: Sarasa and Orie.
* {{Bishonen}}: If a young male is introduced, expect him to be this.
* ChildProdigy: Seira, whose intelligence is said to be on par with [[TeenGenius Glinda's]].
* CrushBlush: Ryyuju gets this whenever Sherlock gets too close.
* DownerEnding: [[spoiler: Chapter 11.]]
* DraggedIntoDrag: Sherlock, much to his dismay.
* DudeLooksLikeALady: It helped Sherlock to pretend to be his sister.
* DudeMagnet: As Glinda, Sherlock has amassed a large amount of male admirers...much to his dismay.
* EmotionlessGirl: Seira acts like one of these.
** Shinn hasn't shown any emotion since he was introduced and has [[CuteMute yet to speak]].
* ExactlyWhatItSaysOnTheTin: Gee, I wonder what this series is about? [[CaptainObvious Oh, it's about a guy who becomes a royal tutor while wearing his sister's dress.]] [[SarcasmMode Who would have guessed?]]
* GirlishPigtails: Sarasa and Orie style their hair this way.
* HairDecorations: All of the girls introduced thus far wear some...And [[WholesomeCrossDresser Sherlock.]]
* HairOfGoldHeartOfGold: Sherlock, a textbook NiceGuy.
* HalfIdenticalTwins: Sherlock and Glinda.
* IntelligenceEqualsIsolation: because of her intellect, Glinda never played with other kids besides Sherlock.
* LongHairedPrettyBoy: Sherlock, which helps in his disguise as his sister.
* {{Meido}}: Anneth. The queen dresses as one on occasion.
* MomLooksLikeASister: And their dad looks like their older brother.
* NamedAfterSomeoneFamous: Sherlock is quite obviously named after the famous fictional detective Sherlock Holmes. The last name that he and his sister share is taken from Sherlock Holmes's author, Sir Arthur Conan Doyle.
* {{Nosebleed}}: Ryuuju gets one after [[spoiler: Sherlock's shirt accidentally falls off, thinking that Glinda's breasts had been exposed.]]
* {{Pettanko}}: [[spoiler: After Sherlock's shirt accidentally falls off after the marathon, Seira helps cover for him by saying that all o his "paddings" fell out, leaving everyone else to believe that Glinda's just really, really flat.]]
* PrecociousCrush: Ryuuju develops one on Glinda...Who, unbeknownst to him, is actually Sherlock
* PrivateTutor: Glinda was originally planned to be this before her diseappearance and her place was secretly taken by her brother Sherlock.
%% * SugarAndIcePersonality: Seira.
%% * TeenGenius: Glinda.
* TricksterTwins: Sarasa and Orie. This comes and bites them in the back in the third chapter when Sherlock punishes them from tricking him.
* {{Tsundere}}: Ryuuju towards Sherlock.
* WhatIf: One side story about what'd happen if Sherlock wasn't an example of DudeLooksLikeALady. He expected it'd make Helmut give up the plan to pass him up as Glinda but to no avail. He was deemed a masculine girl and the only girls he attracted were masculine as well. [[spoiler:He was glad it was AllJustADream]].
* WholesomeCrossdresser: Poor, poor Sherlock.
* WiseBeyondTheirYears: Seira, combined with being a ChildProdigy.
* YaoiFangirl: Anneth, who [[ShipperOnDeck ships her king and Halmut together]].