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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 scanned.]


Related Series

Associated Names
Стань девушкой сегодня!
그녀가 된 날
The Day He Becomes a Woman

Groups Scanlating

Latest Release(s)
c.20 (end) by Crimson Flower 11 months ago
c.19 by Crimson Flower 12 months ago
c.18 by Crimson Flower 12 months ago
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Status in Country of Origin
4 Volumes (Complete)

Completely Scanlated?

Anime Start/End Chapter

User Reviews


User Rating
Average: 7.9 / 10.0 (488 votes)
Bayesian Average: 7.82 / 10.0
 19% (94 votes)
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 26% (127 votes)
 20% (99 votes)
 7% (36 votes)
 5% (22 votes)
 2% (11 votes)
 1% (4 votes)
 1% (5 votes)
 1% (6 votes)

Last Updated
January 12th 2018, 9:46am PST



Category Recommendations





Original Publisher

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

Licensed (in English)

English Publisher

Activity Stats (vs. other series)
Weekly Pos #375 increased(+88)
Monthly Pos #534 increased(+46)
3 Month Pos #639 increased(+73)
6 Month Pos #678 decreased(-330)
Year Pos #384 decreased(-84)

List Stats
On 1321 reading lists
On 474 wish lists
On 1350 completed lists
On 50 unfinished lists
On 329 custom lists

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Forum Posts
kanojo ni naru hi goes on over 2 years ago

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User Comments [ Order by usefulness ]

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Slightly irritating.   
Rating: 4.0 / 10.0
by herosusan123
July 4th, 2017, 8:19pm
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   
Rating: 8.2 / 10.0
by sinxer
April 10th, 2017, 8:53am
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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Rating: 10.0 / 10.0
by moredrowsy
August 4th, 2015, 4:57pm
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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Rating: N/A
by kaabi
May 30th, 2015, 4:19pm
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.

... Last updated on May 30th, 2015, 4:21pm
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Sweet and Touching!   
Rating: 9.0 / 10.0
October 9th, 2014, 12:56pm
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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Rating: 9.0 / 10.0
by arouraleona
December 30th, 2013, 9:53am
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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Rating: 8.0 / 10.0
by ChildofSecrets
October 28th, 2013, 6:04pm
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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Rating: 8.0 / 10.0
by kri91
October 17th, 2013, 9:32am
Its weird (especially d end) but I liked it!
Its cute n funny... N It isn't just mindless shoujo.
Its short enough that it wont take too much time to finish, but long enough that there Is a story!

Recommended* smile
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Say what?   
Rating: 6.5 / 10.0
by MaZzAx
October 5th, 2013, 3:15pm
I really like the boy to girl gender bender stories so this was really good, it went through the feelings experienced by two guy friends who suddenly find it awkward to be together after one of them turns into a girl.
But seriously, what was that ending?
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Review from a fan of BL.   
Rating: 7.0 / 10.0
by mangOKappu
September 22nd, 2013, 2:24am
Okay first of all, just want to say I'm one of those people who, after getting into BL, has never looked back. Meaning that it's reeeeally hard for me to get into guy x girl romance stories again, I just can't help it xP

Anyways, I gave this a try, knowing that it wasn't going to be BL because of the genre and categories but had just a sliver of hope that maybe it would seem BL-y anyways. And in a way, it sort of does..?

Spoiler-free-ish: The story's pretty cute, it's short and I think that works. I like the art style, it's simple and cute. I think the main characters are pretty likeable, maybe a little too average/cliche. I like that the appearance of Mamiya didn't get overemphasized as a girl, she just seemed to have suddenly grown her hair out xD (or it was a wig) and the personality still seemed somewhat natural as having lived a boy all her life. For Miyoshi, he's more the average of the two, but I still like that he's nice and all.

Spoiler now:
Spoiler (mouse over to view)
Okay, so I'm happy and all that Mamiya didn't suddenly become a 'girl', but I found it weird that she was okay with wanting to change her gender to a girl so casually just because his sex changed too. Or at least it seemed that way. Even now I have to think a bit whether to refer to Mamiya as a girl or boy when I type this, because at first it seemed that the only thing that seemed 'girly' that Mamiya changed in his lifestyle after was wearing girl's clothing. That's it. So did he change his gender too? Or since it isn't mentioned, does that mean he doesn't identify? Or are we supposed to assume that his sex and gender change altogether? I know this is a kinda complex subject about gender identity and sex, I myself am not that well-informed either, but it does bother me.

So when Miyoshi claims that he would still love Mamiya even if her sex changed back, it did seem somewhat believable and he even scolds himself for loving Mamiya only after she changed.
Then that's where the ending kinda ruined it a bit for me. AH OKAY so I admit my bias towards BL is showing. But in my opinion, I feel that the story would've wrapped so nicely if Mamiya did turn back into a male. She went through that cocoon thing just to rework herself into a female again, so that meant she did return to a male, but decided she'd leave him for 5 years in doing so.. That part was so sudden and caught me off guard that it felt really rushed and irked me. If they had fleshed that skip out some more, and didn't just have it get tacked on at the end, I think it could have worked, despite my bias. But yeah, Mamiya even said she'd have emerged from the cocoon earlier had Miyoshi said it was okay either way, and it's like, THAT COULD HAVE SAVED YOU GUYS FIVE YEARS. Or however long she was in there for. I think I would've been more okay with that if maybe Mamiya's thoughts were revealed? Like, if she was worried that society would accept them 'more' if she was a girl and that's why she felt she needed the cocoon.. But the whole, it being two guys originally issue wasn't stressed much at all (which I thought was nice) so I don't think Mamiya would have cared so much, and now I'm thinking was it really necessary then for that whole cocoon ending other than needing to keep her as a girl and to have a little drama last minute?

Sorry I typed too much, but I really did sort of like this. I just think it would've had a powerful message (and, admittedly, satisfied my BL bias) had Mamiya's body reverted back to a male's and Miyoshi did continue to love him despite only having feelings for Mamiya after his body was a girl's. I think it could have been touching if Mamiya was more conflicted about keeping her body female because Miyoshi only started loving her because of that, and then Miyoshi stopping her from cocooning to reassure her that his love greater than that. ALSO, maybe it could've worked too if the side effect about reverting sex back wasn't there at all. I don't know.

Anyways, these are just what I feel, sorry about my BL bias (I tried hard to be more open minded okay! I will just let all this be my headcanon xP), but I still think things could have worked with Mamiya being either sex had the ending been reworked. I like to think that gender/sex shouldn't matter in this love story so much, except for the fact that that's a major plot device so it has to be an issue xP

So yeah, people looking for a lot of BL-ness, there is not much, but you can still see it. I think the relationship is cute all throughout and there are several cute and funny moments. The story is fair and I think is worth a try, I'm just curious now what other people think xP

... Last updated on September 22nd, 2013, 2:30am
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