[[PortmanteauSeriesNickname Short for]] ''Hanazakari no Kimitachi e'' ("For All of You in Full Blossom").

Mizuki Ashiya, a Japanese girl who is living in the United States, develops a interest in track and field athlete Izumi Sano after seeing him on television. She becomes so infatuated that she decides she will go back to Japan and attend the same school as he does, just to meet him and become his friend. She is so determined that she doesn't care that the private boarding school Sano goes is an all-male one.

[[WholesomeCrossdresser We all know where this is going]].

Mizuki enters, and luck is with her: she is not only assigned to the same class as Sano, she becomes his roommate! Unfortunately, she soon discovers that Sano has abandoned the field after a lesion, and his athletic career has become a touchy issue.

She is soon discovered, first by the gay school doctor (but he agrees to maintain her secret), and ''then'' by Sano himself. Fortunately, she doesn't notice this last, and Sano decides to [[SecretSecretKeeper maintain and protect her secret]] until he discovers her real intentions or she tells him directly. That turns to be the best decision, since she isn't very good maintaining the {{Bifauxnen}} facade, and if no one discovers her by her slips it is because the rest of the students are victims of a [[BystanderSyndrome Somebody Else's Problem field]] mixed with ClarkKenting.

Soon, Mizuki is slowly involved in the school customs and the little intrigues between her classmates, while at the same time she gets involved in the difficult situations around Sano and his family, helping him to overcome his problems and return to the track.

Since this is a {{Shoujo}} manga, there are also a lot of [[LoveDodecahedron romantic entanglements]], but the most notorious is the one between Mizuki, Sano and Shuichi Nakatsu, a boy who is in love with Mizuki but ignores her real gender and wonders whether he is really gay....

There is no AnimatedAdaptation of this manga yet, but ''four'' {{live action adaptation}}s under similar names, one each in Taiwan and Korea, and two in Japan, have been released.

!!This show provides examples of:

* AbsurdlyPowerfulStudentCouncil: Taken UpToEleven in the adaptations.
* ACupAngst: Mizuki wishes her boobs were bigger. At the same time, she realizes being a UsefulNotes/{{Pettanko}} helps her stay hidden among boys.
* AlmostKiss: A couple between Sano and Mizuki, at least one between Nakatsu and Mizuki, as well.
* AmbiguouslyGay: Himejima. If he's not actually gay, he is at the least very [[CampStraight camp]].
* AnchoredShip: Dr. Umeda with both his high school flame Ryoichi and the persistent Akiha.
* [[AscendedFanboy Ascended Fangirl]]: Gone way past just being friends.
* AttemptedRape: [[RescueRomance Sano to the rescue!]]
* AuraVision: Kayashima
* BeachEpisode
* BeautifulDreamer: Sano to Mizuki and vice-versa. They actually end up sleeping in the same bed quite a bit, resulting in Sano having long nights of trying to control his libido.
** Nakatsu to Mizuki, wherein he almost [[DudeShesLikeInAComa kisses]] her. He stops though, and [[{{Gayngst}} tortures himself]] over [[SweetOnPollyOliver what this could mean]].
* BerserkButton: Sano in the manga and some of the adaptations react this way at the mention of his father.
* BigBrotherInstinct: Shizuki is ''very'' protective of Mizuki. He also dotes on her like crazy.
* {{Bifauxnen}}
* {{Bishonen}}: Nakao, Nanba, Sano... the list goes on. There are a lot of very beautiful men in this manga.
* ButNotTooForeign: Mizuki's brother Shizuki is half-Japanese, half-American.
* CampGay: Nakao and Akiha
* CanonForeigner: The Japanese adaptations add various characters to the series to supplement the story.
* CanNotSpitItOut: This manga would have probably been a lot shorter if everyone were better able to express their feelings out loud...
* TheCasanova: Nanba
* CastFullOfGay: '''*Inhales*''' Umeda, the many unnamed lovers of Umeda, Nakao, Kujou, Kadoma, Mizuki([[NotThisOneThatOne the male one from the early 1900s]]), Satoru, Himejima (questionable, but [[CampGay the level]] [[CampStraight of campness]] is not), [[BiTheWay Akiha]], Ryoichi...
** Actually, WordOfGod says that the only gay character in the series is Umeda, so the others are either Bisexual, have a SingleTargetSexuality, or are just really, really close friends.
* CoolTeacher: Umeda, while not a teacher, is cool enough with Mizuki to just allow her to carry on with her 'disguise' in the manga. While this is arguably irresponsible in all sorts of ways, he at least demands more of an explanation for Mizuki's actions depending on which adaptation you're watching.
** Taken UpToEleven in the 2011 remake - Umeda knows how to respond to all the issues the students are going through and is ultimately responsible for Mizuki's resolution with her classmates.
* CuteLittleFangs: Nakatsu is known to sport them. So is Julia. Also, Nakao.
* DanceOfRomance: Between Sano and Mizuki, naturally.
* ADayInTheLimelight: Kayahima is lucky enough to occasionally get an arc that seriously involves him. He's also gotten a sidestory.
* DeadpanSnarker: Umeda.
* DudeShesLikeInAComa: A few of the [[AlmostKiss almost kisses]] have been whilst Mizuki was slumbering.
* FirstNameBasis: Nakatsu calls most people be their first name. Oddly enough, he doesn't call Kayahima by his name, despite being roommates and seemingly close friends with him.
* ForTheLulz: Umeda in the manga and whatever adaptation you're watching.
** Manga: Kisses Mizuki's brother Shizuki (complete with a description of 'just to piss him off' from the mangaka) and finds some amusement in teasing Nakatsu for his inability to understand his feelings for Mizuki.
** 2011 Remake: Unnecessarily climbs on top of Sano and Nakatsu to get them out of his office.
* GenkiGirl: Mizuki
* GreenEyedMonster: There is a lot of jealously going around. Nakao attacks anyone who goes after Nanba, Nakatsu gets jealous when Mizuki is given attention, and Sano and Mizuki get jealous ''a lot'' when the other is being flirted with.
** Mizuki's friend Julia attempts to pass off as Mizuki's girlfriend to invoke this in Sano.
* [[HugeGuyTinyGirl Huge Guy Tiny Guy]]: Kujou and Kadoma.
* IncompatibleOrientation: This is the reason Nakao's love for Nanba will always remain unrequited.
* IndirectKiss: In the words of Nakatsu, a second-hand smooch.
* InsultToRocks: Sano comments that calling Masao a savage is rude to savages.
* ISeeDeadPeople: Kayashima
* KissingUnderTheInfluence: Sano kisses ''everybody'' when he's drunk.
* LoveTriangle: Mizuki, Sano, and Nakatsu.
* NoPeriodsPeriod: An aversion, which acknowledges the fact that the heroine must hide this important sign of her femininity, and even promotes the advantages of Japanese feminine hygiene products in contra position with their American counterparts.
* OlderThanTheyLook: Azuma Umeda is 54yo, looks 25 & Seira Umeda who is 51, looks only about 20.
* OneGenderSchool: Osaka High School. [[CaptainObvious If it were coed in the first place, Mizuki's need to conceal her gender wouldn't be that problematic.]]
** Osaka High School's sister school, St. Blossom, also qualifies.
* PluckyGirl: Mizuki is definitely one.
* RecursiveCrossdressing: Mizuki has on occasion been forced to 'crossdress' as a girl.
* RecycledSoundtrack: The OP and ED songs aside, the 2011 remake uses music straight from the 2007 version as well - most obviously in the emotional sequences as well as any of the over the top goofy scenes.
* SayMyName: Nanba and Kanako [[spoiler:are turned on by this in a remembered sex scene.]]
* SecretKeeper: Sano and Dr. Umeda know that Mizuki is a girl and help her cover her tracks.
** SecretSecretKeeper: She doesn't know that Sano knows her secret.
** At the end, it turns out that [[spoiler:Kayashima]] also knew the whole time, but felt it wasn't his place to say anything.
* SitchSexuality: Nakatsu struggled with this throughout the manga.
* SleepCute: Sano and Mizuki, many, ''many'' times
* SweetPollyOliver: Mizuki
** SweetOnPollyOliver: How Nakatsu feels about Mizuki.
* TakeThatKiss: Invoked by Umeda on Mizuki's brother Shizuki in the manga.
* TalkingInYourSleep: Sano overhears Mizuki say, [[CrowningMomentOfFunny "Sano, you're so sexyyy."]]
* {{Team Pet}}: Yūjirō.
* ThanksForTheMammary: This is how Sano discovers Mizuki is a girl, and possibly how Dr. Umeda does, as well.
* ThoseTwoGuys: Noe and Sekime
* {{UST}}: You have a girl disguised as a boy sharing a room with a boy that knows she is a girl but she doesn't know he knows, and they each have a crush on the other. There's a lot of this.
* WhereAreTheyNowEpilogue: [[spoiler: Though Mizuki decides to leave Osaka High when her secret's in danger of being exposed, she and Izumi do manage to become an official couple during their college years in the epilogue.]]
* YaoiGuys: Several, but most notably Dr. Umeda and his various lovers.