History Manga / OsananajimiwaOnnanokoniNaare

** So long as it remains on a temporary basis, Iori becomes gradually more comfortable spending time as Shiori, and even enjoys it in some circumstances. Most obviously, after trying to stay a boy for swim class, Shiori enjoys free swimming with the girls when the boys' swim coach has a much harsher exercised routine planned. Cue the boys readily denouncing Shiori as a traitor while she's having fun being a girl. Iori also begins to willingly turn into a girl to avail of his far better cooking skills as Shiori, especially when he himself is a LethalChef otherwise. [[spoiler:By the end, Iori has ceased fearing Sylphie's meddling won't force him to be a different person, and seems to enjoy their rivalry.]]

** So long as it remains on a temporary basis, Iori becomes gradually more comfortable spending time as Shiori, and even enjoys it in some circumstances. Most obviously, after trying to stay a boy for swim class, Shiori enjoys free swimming with the girls when the boys' swim coach has a much harsher exercised routine planned. Cue the boys readily denouncing Shiori as a traitor while she's having fun being a girl. [[spoiler:By the end, Iori has ceased fearing Sylphie's meddling won't force him to be a different person, and seems to enjoy their rivalry.]]

** [[DownplayedTrope Though quite rare]], there are occasions where Shiori being a girl [[ThrowTheDogABone makes her happy instead of miserable]]. Most obviously, after trying to stay a boy for swim class, Shiori enjoys free swimming with the girls when the boys' swim coach has a much harsher exercised routine planned. Cue the boys readily denouncing Shiori a traitor while she's having fun being a girl.

The highschool student Shuichi one day saves a fairy named Sylphie from drowning and she agrees to give him one wish. Shuichi wants a cute girl as a ChildhoodFriend. Sylphie can't create a new person or alter history, so she fulfills his wish by turning Shuichi's male childhood friend Iori Osanai into a girl referred to as "Shiori". However, Shiori is able to change herself back into Iori at will--so long as she's resolute in insisting she's a guy. Determined to see Shuichi's wish granted, Sylphie sets out to turn Iori into a girl as much and for as long as possible!

* AdoptedToTheHouse: Shuichi's parents are out-of-town long term, so he lives at Iori's house. Once Iori starts becoming a girl, their teacher expresses (largely unfounded) worry they will go FromRoommatesToRomance.
* AmbiguouslyAbsentParent: Iori's mother is the only one besides Iori and Shuichi shown in their house; his father goes unmentioned.

* AndTheAdventureContinues: [[spoiler:Sylphie and Iori manage to work together to prevent Seraphie from erasing Iori's original identity and Shuichi convinces her she would be violating the spirit of his wish if she succeeded. But Seraphie simply hands the task back to her daughter and informs her she can't return home until she completes it. Though they've perhaps grown some respect for each other, Sylphie and Iori will continue to fight over Iori's gender as before.]]
* BabiesEverAfter: [[spoiler:The last volume has an epilogue which shows an older Shiori explaining to her son how she became a woman permanently in college after falling in love and marrying Shuichi. This inspires her son to say he wants to grow up to be a girl like his mother did. Then the very last panel shows this was all Sylphie's idea of "the kind of ending we should all strive for". Shuichi was amused, but Shiori and Miyu weren't.]]
* BeCarefulWhatYouWishFor: Subverted; Iori turning into a girl was an unexpected consequence of Shuichi's wish, but while Iori dislikes it, ''Shuichi'' is perfectly pleased with it. This becomes a DoubleSubversion whenever it looks like Iori could be stuck permanently against his will, which Shuichi doesn't approve of. [[spoiler:This goes double when Sylphie's mother Seraphie finds it necessary to erase Iori in favor of Shiori in one way or another.]]
* BedtimeBrainwashing: Sylphia once whispered "You are a (perfect) girl." over and over to a sleeping Shiori, giving her an {{Anxiety Dream|s}} where she's stuck as a girl and dating Shuichi.
* BenevolentGenie: Sylphie fulfills the intent of Shuichi's wish as best as she can, though she's far from "benevolent" from Iori's perspective. She does ignore Shuichi telling her to forget about the wish, but he's quite flippant about the issue. [[spoiler:Her mother Seraphie is a darker twist with shades of LiteralGenie: she ''cares'' about the spirit of the wish and wants to please Shuichi, but doesn't understand how humans would react to the means or consequences. Even then, Shuichi is able to convince Seraphie her drastic efforts were in err, and she gives the task back to her daughter.]]

** Shuichi is a {{Jerkass}} who deeply enjoys watching Iori suffer as a result of his wish, but he still draws a line at mind control or taking advantage of him getting sick after caring for him.
** For as much as Sylphie enjoys humiliating Iori, she ''immediately'' rejects her mother's idea to {{curse}} Shiori with [[TheNudifier perpetual nudity]] so she'd be too bodily-conscious to ever change back. At the very least, she knows Shuichi would be furious.

** Sylphie acts like a FairyGodmother-wannabe to Shuichi, trying to grant his wish to make him happy, but not caring how miserable she makes Iori. She's also driven by obsession with granting the wish in of itself and offense that her spells are being undone. Despite all this, so long as Shiori ''can'' change herself back into Iori, Sylphie's just treated as a nuisance.

* FirstLawOfGenderBending: Zig-zagged; Sylphie is a powerful magical being who sees it as her duty to {{enforced|Trope}} the Law to grant Shuichi's wish, changing Iori at every opportunity and sometimes scheming to make it permanent in one way or another. However, Iori being able to change back ''at all'' is quite exceptional--almost anyone else would be immediately stuck that way the first time. [[spoiler:Ultimately, it remains an unsettled issue for the foreseeable future.]]

* NamedByDemocracy: Although Iori technically came up with the name "Shiori" for his girl form, it spreads against his wishes thanks to Shuichi. After spending an extended time as a girl to keep the transformation secret, it becomes so ingrained that the class spend some time calling him "Shiori-chan" ''even in male form''.

** Sylphie sometimes invokes this trope to argue Iori should stop resisting. She is astoundingly unconvincing, especially when she thinks Shiori should hook up Shuichi. [[spoiler:More seriously, Seraphie thinks making Shiori "happy" with being a girl justifies tricking or forcing her to believe she was ''always'' a girl.]]

** One WhatIf omake shows if Shuichi became a girl instead of Iori, and the latter is shocked how eager Shuichi looks. Another shows if Iori and Miyu ''both'' changed genders; the former seems fine with it because it "balances out".

* SobriquetSexSwitch: Iori's female form is known as "Shiori", a {{portmanteau}} of the original name and the English pronoun "she". When Shiori is pretending to have always been a girl, she uses the surname "Yamauchi", an AlternateCharacterReading of "Osanai". This started as an improvised alias for Iori's mother, but Shuichi decided to tell that whole class.

** Since Sylphie's trying to fulfill Shuichi's wish for a "cute childhood girl friend", Shiori experiences some changes beyond physical sex to better embody his ideal girl. Shuichi likes {{Cute Clumsy Girl}}s, so [[MenAreStrongWomenArePretty Shiori is a much worse athlete than Iori]], but [[FeminineWomenCanCook a much better cook]]. Though not specified, this may be why Shiori [[AttractiveBentGender is considered extremely cute]].