Actress Yuina Kuroshima Has a Baby Without Officially Marrying — 5ch: ‘That’s Not What “Entering the Registry” Means When It’s Both People’s First Marriage’

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The story

On the 15th, actress Yuina Kuroshima (29) appeared on Nippon TV’s “Osharete Clip” and once again confirmed that she and actor Hio Miyazawa (32) have had their first child together, and that the two remain in a common-law marriage without ever having officially registered it. Ever since she announced her pregnancy in January 2024, she had already signaled she wouldn’t register the marriage, but now that she’s actually explained her reasoning, reactions poured in on 5ch’s Geino/Supo-soku+ board. Theories flew back and forth — maybe she doesn’t want to change her surname, maybe it’s to dodge the hassle of paperwork if they ever divorce, maybe it reflects a mindset that puts personal identity first — and there were also a lot of posts correcting each other on where Miyazawa’s family actually comes from.

Yuina Kuroshima, in a common-law marriage with — and now a new mother thanks to — a popular actor: the public reacts with “So it really is a common-law marriage” — even her own mother was stunned, asking “Why?!” — she reveals on TV why they haven’t registered the marriage

Actress Yuina Kuroshima (29) appeared on Nippon TV’s “Osharete Clip” on the 15th, where she spoke about giving birth and about marriage.

On January 16, 2024, Kuroshima announced that she was pregnant with her first child with actor Hio Miyazawa (32), and that the two would not be registering their marriage.

Source: news.yahoo.co.jp / Original article here

What people said

2AnonymousNov 16, 2026 00:34
It's convenient if they ever get divorced.
9AnonymousNov 16, 2026 00:38
Re: #2
Changing your name on your credit cards and everything is such a pain.
4AnonymousNov 16, 2026 00:35
This is gonna get messy down the road
especially if the other person goes and marries someone else later.
87AnonymousNov 16, 2026 01:37
Re: #4
Not really
you just draw up a contract on how to raise the kid before it's even born.
5AnonymousNov 16, 2026 00:35
They're both rooted in Okinawa, so if they're both fine with it, that's fine.
24AnonymousNov 16, 2026 00:46
Re: #5
His dad just sings an Okinawan song ("Shima Uta"/"Island Song")
I don't think the Miyazawa family is actually rooted in Okinawa.
29AnonymousNov 16, 2026 00:47
Re: #5
Hio Miyazawa has nothing to do with Okinawa
his dad's from Yamanashi Prefecture.
39AnonymousNov 16, 2026 00:50
Re: #5
His dad's from Yamanashi, his mom's from Kanagawa and half American
Hio himself was born in the US and raised in Tokyo, so he's a quarter-American.
6AnonymousNov 16, 2026 00:35
Why not just have the husband change his surname?
30AnonymousNov 16, 2026 00:49
Re: #6
She said they both wanted to keep the surnames they grew up with.
41AnonymousNov 16, 2026 00:51
Re: #30
Doesn't really feel like that's the real reason, lol.
47AnonymousNov 16, 2026 00:55
Re: #30
So the kid gets double power with two surnames then
they probably won't even let the kid choose
both and neither at once — guess the kid's generation gets to sort that one out.
7AnonymousNov 16, 2026 00:36
Forget that pointless hang-up and put the kid first already.
10AnonymousNov 16, 2026 00:38
It's a common-law marriage because it's not a legally recognized marital relationship, right?
what else would it be?
12AnonymousNov 16, 2026 00:40
On some show where she visited her parents' place,
her grandpa or grandma was telling her to hurry up and find someone to marry.
13AnonymousNov 16, 2026 00:41
Couldn't he at least become a "muko-yoshi" (a husband legally adopted into the wife's family register) until the kid's grown?
Try putting yourself in the kid's shoes, whose whole life is getting tossed around like it's some casual snack decision…
14AnonymousNov 16, 2026 00:41
It's not a legal marriage, so yeah — common-law it is.
16AnonymousNov 16, 2026 00:41
So that means other women are free to go after Hio Miyazawa, right?
Since they're not actually married.
17AnonymousNov 16, 2026 00:42
Great deal for the guy, honestly
he gets to stay legally unaccountable
and once he's bored he can move straight on to the next one.
18AnonymousNov 16, 2026 00:42
Hmm. It really is nothing but a common-law marriage.
Wonder what the kid will think about it once they're grown.
19AnonymousNov 16, 2026 00:43
If it's really just about not wanting to change her surname,
are they even living together?
20AnonymousNov 16, 2026 00:44
Since they're not legally married, there's no "divorce" if they split — they just go back to being single. Wonder what happens to the kid on the family register.
78AnonymousNov 16, 2026 01:18
Re: #20
Not an expert, but since the child wasn't born within a legal marriage, it'd be an acknowledged "illegitimate child" (hichakushutsushi)
basically treated the same as a mistress's kid.
21AnonymousNov 16, 2026 00:44
The guy must be grinning ear to ear, lol.
23AnonymousNov 16, 2026 00:46
"Mommy, why do you and daddy have different last names~?"
37AnonymousNov 16, 2026 00:50
Re: #24
I heard he's actually from Yamanashi but was seriously bothered by the fact that "Shima Uta" became such a huge hit.
55AnonymousNov 16, 2026 00:57
Re: #37
Apparently Okinawan locals were initially confused, even a bit annoyed, since tourists kept going on and on about "THE BOOM's Shima Uta" while ignoring the many traditional island songs that already existed there
though these days it's been fully embraced.
53AnonymousNov 16, 2026 00:56
Is it because Kuroshima's the daughter of some seriously wealthy family or something?
60AnonymousNov 16, 2026 01:00
Re: #53
Isn't it more of an ideological thing?
A mindset that puts personal identity above everything else
though honestly, if the My Number system were just properly digitized, this whole thing would be a non-issue, lol.
54AnonymousNov 16, 2026 00:57
Re: #1
If she doesn't want to change her name,
why not just go with the separate-surnames-for-married-couples system everyone's talking about these days?
The fact that they're not even doing that suggests there's some other reason they don't want to be legally married.
59AnonymousNov 16, 2026 00:59
Re: #54
That system still isn't legally recognized in Japan, so if you want to keep separate surnames, a common-law marriage is your only option.
65AnonymousNov 16, 2026 01:04
Technically, when it's both people's first marriage, you're not supposed to call it "nyuseki" (entering the family register) at all.
91AnonymousNov 16, 2026 01:38
Re: #65
Well, learned something today.
67AnonymousNov 16, 2026 01:06
Team "they should've registered the marriage before the birth, even if they end up divorcing someday" — for the kid's sake.
69AnonymousNov 16, 2026 01:10
Re: #67
He's obviously going to legally acknowledge paternity, right? Unless she's an idiot, she's not just going to roll over and accept "oh well, common-law marriage it is" without a fight. I'm sure they've got some kind of legal arrangement in place for the kid's sake. …Probably.
68AnonymousNov 16, 2026 01:10
Re: #1
I thought this was about Hio Miyazawa's citizenship situation.
What did they end up doing about the kid's nationality?
73AnonymousNov 16, 2026 01:13
Re: #68
He used to hold dual citizenship but chose Japanese, so the kid is Japanese too.
74AnonymousNov 16, 2026 01:14
Re: #69
But doesn't the family register log exactly who filed what and when?

Thinking about that, registering the marriage before the birth — not just acknowledging paternity afterward — seems like it would've been better for the kid.
77AnonymousNov 16, 2026 01:18
Re: #74
Feeling like your own say got pushed to the back burner isn't really about early or late timing — after that it's just a financial issue.
The two of them had to settle the surname question first,
so the kid's identity just had to wait its turn after that.

Background and Key Points of This Debate

A common-law marriage (“jikkonkon”) is a de facto marital relationship that doesn’t involve legally registering the marriage (“nyuseki”), and under Japanese law it’s treated similarly to a “common-law union” (naien). A child born to an unmarried couple, even if the father legally acknowledges paternity, is still recorded on the family register as a child born out of wedlock (“hichakushutsushi”), and can be treated differently from a child of a legal marriage when it comes to custody and inheritance. The “she doesn’t want to change her surname” explanation that came up repeatedly in the thread reflects the fact that Japan has not legislated a system allowing married couples to keep separate surnames, so there is currently no way to marry legally while each partner keeps their own name. Posters speculated about Miyazawa’s family background (a father from Yamanashi, a mother from Kanagawa who is half Japanese and half American) and about the child’s nationality, but none of this has been officially confirmed by Miyazawa himself or his agency, so it should be treated as speculation. There was also debate over the word “nyuseki” itself, since it technically refers to entering a spouse’s family register through marriage — making it, strictly speaking, not the correct term for two first-time spouses — with the word choice itself becoming one of the thread’s talking points.

*This article is compiled as an excerpt and summary of the 5ch (Geino/Supo-soku+) thread “[Entertainment] Actress Yuina Kuroshima in Common-Law Marriage & Gives Birth with Popular Actor — Public Reacts “So It Really Is a Common-Law Marriage” — Even Her Mother Stunned, Asking “Why?” — Reveals Reason for Not Registering the Marriage.”

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