''The Day of Revolution'' is a two-volume manga series by Mikiyo Tsuda about a fairly normal, if scrawny and undersized, high-school boy named Kei Yoshikawa who discovers after a series of fainting spells that he is intersexed and genetically female. (While this could be any one of several real-world conditions, the exact one afflicting Kei is left unspecified.) Faced with the choice (as he sees it) between remaining an "incomplete man" or becoming a "complete woman" Kei elects (albeit reluctantly) to embrace his newly discovered femininity in the hope that a new start as a girl will heal his strained relationship with his cold and distant father.

So Kei takes a half-year off school for therapy, training and "adjustments" (i.e., surgeries) to feminize his body before returning to repeat freshman year as a girl, hoping that by wearing her hair long and pronouncing her name 'Megumi' (which can be written using the same kanji as 'Kei') she can somehow avoid recognition by her former classmates. Naturally, things aren't going to be that easy.

The manga as a whole is a fairly realistic and non-melodramatic depiction of the difficulties inherent in Kei/Megumi's situation.

!!''The Day of Revolution'' contains examples of:

* AlternateCharacterReading - How Kei became Megumi; this type of name change might make sorting out PersonalSeals and certain documents easier.
* AttractiveBentGender - inevitable, seeing as [[EvenTheGuysWantHim Even The Boys Wanted Him]] pre-GenderBender.
* AttemptedRape - By Nakagawa on Megumi, allowing her to commiserate with Mikoto when he tells her about his own NearRapeExperience.
%%* TheBeard - Mikoto. At least that's how his sister presents him to Megumi; Mikoto himself has other ideas. Megumi soon gets other ideas as well.
%%* BleachedUnderpants - Tsuda moonlights drawing Yaoi. It shows
* BreakingTheFourthWall: [[http://www.mangarush.com/manga/the-day-of-revolution/v-1/3/p-60 That's going a bit too far... this is a shoujo manga, after all!]]
* CharacterOverlap - with ''Manga/PrincessPrincess''
* TheChick: Avoiding this is one reason Megumi does not want to hang out with her old friends. Ironic as she always was The Chick of "The Tail Wags the Dog Quartet", even as Kei
* CoolBigSis - Makoto, Megumi's BFF and guide to all things feminine.
* DifferentForGirls - focused more on the internal/psychological aspects then the external/social ones.
* DoesNotLikeMen - Invoked to explain why Megumi is using Makoto to hide her face from some of her old friends.
* EasySexChange - Zig-zagged: Megumi's gender reassignment is said to have taken months, even though an intersexed body like Megumi's probably required fewer 'adjustments' then most. However, everyone agreed to it far too easily, and for fairly dubious reasons.
* EvenTheGuysWantHim - Kei, before her change. Mikoto, much to his distress. [[spoiler: Their similar experiences resisting unwanted advances from boys actually draws them together.]]
* GenderBender - Kei/Megumi
* GenderBlenderName - Megumi, Makoto, Mikoto
%%* HasTwoMommies - Junior, in the under-the-dustjacket {{omake}}
* HeroOfAnotherStory - Megumi's boyfriend Mikoto is one of the protagonists of Tsuda's ''PrincessPrincess''
%%* HighSchool - Japanese version
%%* HoYay - Kei and pretty much everybody.
* ItsNotYouItsMe: It's not that Megumi doesn't want to see her old friends, she doesn't feel ready to face the inevitable storm of romantic interest.
%%* JumpingTheGenderBarrier - played for laughs. The boys think it's a lock, but Megumi is thoroughly squicked.
* RaisedAsTheOppositeGender - Kei was raised as a boy before being revealed as genetically female.
* RomanticTwoGirlFriendship - Parodied. Megumi tries to latch onto Makoto whenever the boys scare her too much; Makoto's interest varies as RuleOfFunny demands.
* SittingOnTheRoof: Nakagawa's entire conflict with Megumi's former TrueCompanions is over who -- and more importantly, who does not -- get to hang out on the school roof. They're willing to share but he isn't, because sole possession of the roof would cement his BigManOnCampus status.
* SkinshipGrope: Megumi complains that she doesn't have breasts; Makoto proves otherwise.
* SecondLawOfGenderBending - Of the "reluctant admission" variety. Megumi concedes "I really am a girl now" near the end of volume one. Volume 2 is more about JumpingTheGenderBarrier than DifferentForGirls.
* SeriousBusiness: Nakagawa seems to believe that possession of the roof justifies kidnapping and physical assault.
* ThirdLawOfGenderBending - Going back to school as a girl forces Megumi to wear a very stereotypical [[SailorFuku sailor-style girls' school uniform]] complete with a middie blouse and a ridiculously short skirt.
* {{Tomboy}} - Megumi, for obvious reasons. More so in the epilogue, where she seems to have adopted "Tomboy" as her style.
%%* TomboyishName
* {{Transgender}} - though Makoto asserts that Megumi isn't undergoing an actual "sex change" since she always has been genetically female.
* TrueCompanions - the "Tail Wags the Dog Quartet (minus one)"
* UnsettlingGenderReveal - Averted. Megumi actually wanted to "drop a Bridget" on a persistent admirer, but he just wouldn't listen.
* WellDoneSonGuy - Megumi opts for gender reassignment largely in the hope that she can finally have the sort of healthy relationship with her father that eluded her as a boy.
%%* WrongGeneticSex