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The story
Nakai Masahiro (54) and his longtime girlfriend, known as Ms. M, have reportedly reached a relationship stage that could be called common-law marriage, according to Weekly Josei Seven. Per the report, the two were spotted walking together after a shopping trip as of December 2025, with Ms. M shifting the base of her daily life to Nakai’s home as the couple gradually consolidates their living arrangements into one household. Framed as a shift for Nakai, who has long declared himself a confirmed bachelor, the news also sparked chatter on 5ch about the age gap between the two and questions over why they haven’t filed a marriage registration and remain common-law instead.
2026.09.29 07:00
The relationship between Nakai Masahiro (54) and his longtime girlfriend, Ms. M, has reportedly entered a new stage. Last December, a reporter from this magazine, Weekly Josei Seven, came across Nakai and Ms. M walking together after a shopping trip.
——Any plans to marry?
Source: j7p.jp / Original article here
What people said
How old is Ms. M anyway?
Maybe about 12 years younger (a full "eto" zodiac cycle)?
That's probably why he retired in such a hurry, eh
No loose ends left, huh
Given how much of a Johnny's lapdog Fuji TV still is, that's not happening
He's probably got tens of billions of yen saved up already, so it doesn't matter either way, I'd guess
But what do I know
His savings are probably in the tens-of-billions-of-yen range, right?
He doesn't need one, idiot — the guy's probably got 100 billion yen saved up
Pairing Kimutaku up with a crew of criminals and has-beens would just be a burden on Kimutaku
What's even the point of staying common-law?
Is it just that the paperwork's a hassle and he doesn't want to be on the hook if something happens?
Does he not even want to leave her an inheritance? Not like he can spend it once he's dead anyway
Common-law partners do have inheritance rights, you know
He'd blow past a million subscribers in no time — get Watanabe Mahiru as his co-host
Someday he'll collab with "Kimutako" lol (a jokey mangling of Kimutaku, Kimura Takuya's nickname)
This has been going on since 15 years ago, right?
That was already when SMAP was on the decline
He probably just avoided marriage so he could keep working as a celebrity
But the fact he still hasn't filed the marriage papers makes you wonder if he's angling for a comeback in showbiz
Why would staying unmarried be necessary to keep being a celebrity?
Nakai just wants to keep playing the field, that's all
Yeah, he's a private citizen now, so I think people should just leave him be
But it's because that guy keeps making noise that people keep bringing it back up
They're rich yet they keep dragging their feet
Meanwhile poor people out there get married and raise kids despite having no money
But these two just keep playing around forever
At this rate Nakai will hit 60 before he ever gets married lol
Background and Key Points of This Story
A common-law relationship (naien) refers to a de facto marital arrangement in which no official marriage registration has been filed. If a certain period of cohabitation and other factors are recognized, such couples can receive protections close to those of legal marriage in areas like inheritance, pensions, and tax treatment. The comment noting that “common-law partners do have inheritance rights” reflects this legal reality. That said, it’s worth noting that the sighting reported in the article dates to December 2025 and isn’t firsthand confirmation of the current state of the relationship. Some responses in the thread also referenced Nakai’s 2025 withdrawal from show business following a scandal involving trouble with a woman, with speculation about damages and his future income sources. These comments draw on already-reported, well-known background, and this article itself concerns reporting on a private relationship. As for why the couple hasn’t filed a marriage registration, commenters only speculated — “it’s a hassle,” “he doesn’t want the responsibility” — and neither party has publicly stated their intentions.
※This article is compiled as an excerpt and summary of the 5ch (Geinou/Sports News+) thread “Nakai Masahiro’s steadfast bachelor stance shifts — longtime girlfriend Ms. M moves the base of her life to Nakai’s home, consolidating into one household as they become a “common-law” couple [Ailuropoda melanoleuca★].”
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