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Kanojo ni Naru Hi  
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Miyoshi is always competing and losing against his childhood friend, Mamiya, who is good at everything. One day, Mamiya collapses from illness and is hospitalized for several weeks. When he returns to school, it turns out he is genetically female and has decided to try living his life as a girl now much to Miyoshi's horror.

Several extras have yet to be scanlated.


Related Series

Associated Names
Becoming a Girl one day (German)
The Day He Becomes a Woman
Стань девушкой сегодня!
그녀가 된 날

Groups Scanlating

Latest Release(s)
v.3 c.12.5 by genderbenderbb2 about 1 year ago
c.20 (end) by Crimson Flower over 4 years ago
c.19 by Crimson Flower over 4 years ago
Search for all releases of this series

in Country of Origin
4 Volumes (Complete)

Completely Scanlated?

Anime Start/End Chapter

User Reviews


User Rating
Average: 7.8 / 10.0 (566 votes)
Bayesian Average: 7.73 / 10.0

Last Updated
June 6th 2021, 6:11pm PST



Category Recommendations





Original Publisher

Serialized In (magazine)
Ane Lala (Hakusensha)
LaLa DX (Hakusensha)

Licensed (in English)

English Publisher

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3 Month Pos #1954 increased(+155)
6 Month Pos #2346 increased(+15)
Year Pos #2464 decreased(-173)

List Stats
On 1292 reading lists
On 535 wish lists
On 1707 completed lists
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User Comments  [ Order by usefulness ]
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Wow this is amazing  
by Trimutius
May 12th, 2020, 9:09pm
Rating: 10.0 / 10.0
First time i read this only first volume was available. And suddenly i discovered there was actually continuation after... And i loved continuation. But romance is just my thing, and i like the sex change part too, though reasons cannot be explained without spoiler:
Spoiler (mouse over to view)
The way it is presented and explained towards the end is that it is not that person randomly emerges, but rather they emerge so that they can have children with a person who is dear to them.
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Not quite doing it...  
by myopius
April 22nd, 2020, 6:53am
Rating: N/A
Not to sound too harsh, since I only read a few chapters of this before dropping it, and I see that many other reviewers liked it. But this feels like exhibit A in why I barely read any shoujo manga these days. The author practically only has enough interesting story content for a one-shot, but stretches it out with cliched school events, characters acting dense, characters brooding and being insecure, random side characters getting in the way...

I personally found Boku to Kanojo no XXX a much more enjoyable example of a manga with this premise. Though if you're actually transgender or transitioning and want a manga that goes deep into the psychological issues so you can self-insert, maybe this manga is better for you. Or if you have a tolerance for the things I complained about in the previous paragraph, and just want to see a mildly cute couple in a relatively unusual setting, go for it.

... Last updated on April 22nd, 2020, 6:57am
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Typical shoujo romance with an odd premise.  
by Neofit
October 17th, 2018, 8:13am
Rating: 5.0 / 10.0
If you subscribe to the idea that gender and sex are separate, this will offend you. If you're a normal person, the cheesy shoujo drama will offend you instead.
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Slightly irritating.  
by herosusan123
July 4th, 2017, 8:19pm
Rating: 4.0 / 10.0
It was a great idea, but there were some issues with the characters.
Spoiler (mouse over to view)
For instance, Mamiya stated that he needed to adapt to his new body (indicating that he still identifies as a male) + Miyoshi was okay with Mamiya reverting back to his original body so I don't understand the need for the first half of the story. If they realized that they were in love with each other regardless of gender then it was pointless for Mamiya to spend years in the hospital and risk his health by remaining a woman. Especially since Mamiya didn't quite enjoy all the changes anyways. It just seemed pretty heteronormative for the story to head in that direction.
Also, some of the statements in this manga were really sexist. I'm sure the author didn't mean any harm since a majority of Japanese people (any maybe the entire world) are brought up to believe in a binary system with specific gender roles. It was just too obvious to ignore, and it pops up throughout the entire manga. There was a point where Mamiya states "when I was male, no matter how much I loved you I couldn't achieve this feeling" which he believed was due to him becoming more feminine? It just makes no sense to me that you could love the same person more by: 1. changing your gender and 2. being feminine.

Despite a few irritating points, I thought it was a great concept. The idea that humans can change sex depending on the needs of the species is interesting. Although, it could have been better if the process was optional and not random. Otherwise there has to be some sort of outside force that magically keeps the female to male ratio equal.
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loved it  
by sinxer
April 10th, 2017, 8:53am
Rating: 8.2 / 10.0
my only issue is their feelings about if she didn't change sex, every so often it would be mentioned that if she never became a girl they wouldn't have gotten together but at the same time Miyoshi didn't care if she turned back into a boy as he would love her anyway. It just seemed slightly off to me since Mamiya's personality didn't really change all that much till later so there wasn't a chance that they'd end up together anyway? So it felt a little superficial as he had to be a she for him to realize he could love her as a he or a she.
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by moredrowsy
August 4th, 2015, 4:57pm
Rating: 10.0 / 10.0
Despite the gender bender tag, it's not really gay. The first chapter reveals that the guy physiologically and physically becomes a girl via some science-magic phenomenon. From there on, he's a full fledge girl except that he "used to be" a guy. The romance in this story is the concern. It touches on the subject of how deep can a person love. Can you love that person if he used to be a guy but is now a full fledge girl? Can you also ignore the social stigma behind this? The manga handles these issues quite well without dragging on melodrama because both characters think sensibly. It's a short and enjoyable read.

... Last updated on August 4th, 2015, 5:22pm
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by kaabi
May 30th, 2015, 4:19pm
Rating: 9.0 / 10.0
Haha I really liked this! It was really funny at the beginning but dang it sure makes a dramatic shift towards the end of the first volume lol. I think the concept of emergence could've been explained better as well since when things happen later on in the manga it's kind of wtf. But overall I really like the author's explorations of gender identity and sexuality, and Mamiya still feels like "Mamiya" even after he turns into a female. And after the momentary "wtf" of the shift from comedy to drama it really becomes a rather touching story, and the continuation is great as well. I love how she focuses on showing them deal with their relationship and hints at societal discrimination as well. I found the comedic beginning enjoyable, but after the drama and seeing the story take a more serious turn it really felt like the series and characters were maturing which is not common and a pleasure to read.

Another note: I find both characters very fleshed out and enjoyable to read about, whether they were male or female! And the relationship and development of equality within it is refreshing as well.

Edit: After finishing it all, I like it even more!! Continuations can be hit or miss, and the author really successfully carried this continuation out.
Spoiler (mouse over to view)
It's so sweet to follow their progress through life as they grow older (and as I grew older myself lol), the hardships they face and the good and bad times. The gender identity and discrimination still plays a great role and it's great to see how the two of them adapt to living together and balance responsibilities and stuff. There was this one moment that the author put in which was really impactful and gave me a lot of feels, which happens about ten years or so after Mamiya became a female forever, which is when Miyoshi remembers male Mamiya and realizes he will never see him again and it is a very emotional moment, but then he realizes the female Mamiya in front of him is the same person and is so happy to have her in his life ;__; that was a very beautiful moment and the author portrayed it really well and even tho I finished this a while back that scene still really stands out in my memory and it is one of the things I remember most from this manga ;___; so many feels!!!

... Last updated on May 23rd, 2019, 12:13am
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Sweet and Touching!  
October 9th, 2014, 12:56pm
Rating: 9.0 / 10.0
Short, sweet and simple. The pacing is good for a shoujo manga, but then again there was only one volume until a few days ago. I personally like gender benders, so this manga immediately struck a chord with me.

As for the art, it differs a little from your typical shoujo manga. For example, Mamiya's eyes aren't as big and round as you would expect from a shoujo manga, but damn is she beautiful! Miyoshi is definitely good looking enough for a guy.

The setting is a little weird. The idea of males transforming into females is a bit far-fetched, but I can see some correlation to the real world. Interestingly, the high mortality rate among "emerged people" might have something to do with the high suicide rate among transgendered people as well, but that's something for another day.

The characters are likeable as well. Not a lot of pages for character development, but you get the hang of how both Miyoshi and Mamiya feel about the "emergence" clearly. Their interactions with each other is funny and cute. Miyoshi and Mamiya clearly cares for each other, and the dialogue is straight to the point with that!

All in all, a good short read (so far, the series is said to be updated every bi-monthly from now on!) so if you have an hour or two to spare, do give this series a try please! I mean, there's only 6 chapters so far, so what can you lose, right? Only reason I gave it a point short of a perfect score is because of the short length, but that could change pretty soon!
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by arouraleona
December 30th, 2013, 9:53am
Rating: 9.0 / 10.0
I find this to be extremely sweet, and rather brilliant.

The author introduces a world where gender is a naturally (in world) changeable thing, where your gender can switch based on a balance need. This happens now (as in OUR world now) in creatures like fish, so it isn't totally out there.

In such a world a change would be understood by all, and if it isn't a "usual" thing that happens to everyone, it isn't an "unusual" or unknown thing, either. No way, in other words, to play off a person's gender change as anything other than what it is.

So, when Mamiya becomes a girl, there's shock at her changing when she is so old (it is more common to change as a child). (It's also mentioned that the older you are, the harder the change can be, thus leading to a higher mortality rate, and if you know anyone who is trans, or just know statistics of that group, suicide among people whose gender perception goes against the social norm is very high, so this is a nice little toss in for real-world relation.) They also accept her as *her* quite quickly. As he makes an attempt to do the same. It's not *easy* (can you IMAGINE having your first period as an older high school student when you had no idea it would come, but as a guy had some vague understanding ... and probably thought of it as gross ... but no real knowledge...), but as a character who has had unexpected changes in his life (his mother leaving when he was a child, for example), he has a mental foundation to begin accepting his new self. As well as an ... if not entirely supportive (he's afraid of women!) friend, at least one who cares for her regardless of her gender. Though the care changes a bit after boobs...because hormones, obviously.

I've thought about it a lot...if my best friend when I was that age became a guy, I would have fallen in love with him, no question. (I was more than half in love with her in the first place, lol) So. Maybe that's why I found this manga so much fun. It's got a lotta cliche's, but that twist of freshness, friendship, and self-discovery make it worth the read.

Also, it's only 5 chapters. It's not all that great an investment in time! Read it!!!

... Last updated on February 21st, 2015, 11:03pm
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by ChildofSecrets
October 28th, 2013, 6:04pm
Rating: 8.0 / 10.0
Yep it's weird and I thought the ending was borderline freaky rather than sentimental. But it's not really a good or a bad weird, more like the "off" kind of weird. It was a soso story but the lack of explanation, unrealistic reactions of peers/protagonists and the fast sequencing of events fell short of the target. To me, it wasn't thorough enough to make complete sense.

I give it credit for at least changing up the gender-bender boy to girl backdrop.
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