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The story
Monogatari Corporation, which operates the yakiniku (Japanese BBQ) chain Yakiniku King, announced on October 5, 2026 that its official app’s member management system had suffered unauthorized access by a third party, leaking information on 10,788,963 members. With the app’s total registered users at 10,808,784, that means almost everyone who ever signed up was affected — a massive breach. The leaked data includes membership numbers, names, email addresses, and phone numbers; according to the company, login passwords, birth dates, and payment information were not included. On 5ch, speculation that “passwords must have leaked too” spread immediately after the announcement, but was quickly corrected by posters quoting the official statement directly, and the thread then veered off into a tangential debate about registering “throwaway accounts” on LINE.
Monogatari Corporation, which operates Yakiniku King, announced on October 5 that its official app’s member management system had been accessed without authorization by a third party, leaking information on 10,788,963 members. The app has 10,808,784 registered users, meaning virtually all of them are affected.
Source: news.yahoo.co.jp / Original article here
What people said
That's just for us plebs (lit. "lower-class citizens")
Daiwa Securities had one today too, you know
It's over
Honestly, it might not even be a joke — AI could actually end up destroying civilization
You're just an idiot handing over your personal info for a few hundred yen
Re: #26
Nah, that's just you guys being clueless
Don't even know how to protect yourselves? lol
It's a yakiniku (Japanese BBQ) chain, I think?
Didn't know it had 350 locations nationwide
If 300 people visit each store a day, that's 300×365×350 = 38 million visits a year
Sounds about right?
The official number was 10.78 million, right?
So that means… (lol)
These days it's less about registering an email and more about adding a LINE friend account
What leaked was: full name, name reading, gender, postal code, mobile number, favorite store, email, and password
Anyone reusing their password is done for
Why would the password leak though?
Aren't passwords supposed to be stored hashed?
Lol, didn't even read the article
> The leaked information includes membership number, name (as registered in the app), email address, and phone number. Meanwhile, login password, date of birth, gender, postal code, and store usage history including accumulated points were not leaked. The company states it does not hold payment information such as credit card details.
The fact that 10 million people's data leaked is the real shock here
Right
One in ten people, huh
Probably tons of duplicate entries — people re-registering, switching phones, forgetting their passwords, stuff like that
There's no actual proof of that though lol
I work in systems — credit card numbers generally aren't stored in full
As long as the card company itself isn't breached, you're mostly okay
Any system in this day and age that still stores full card numbers is garbage
Background and Key Points of This Story
The data leaked this time belongs to Yakiniku King’s official app membership system. The company states it doesn’t hold credit card information, so that wasn’t exposed, and that passwords, birth dates, and store usage history (including accumulated points) also weren’t leaked. Still, the leaked membership numbers, names, email addresses, and phone numbers could on their own be used as material for targeted phishing or impersonation, so caution is warranted. On the thread, speculation that “even the passwords leaked” spread right after the announcement, but was corrected early on by posters quoting the official statement directly. Some also argued that “registering through a LINE throwaway account would have prevented this,” but since LINE generally allows only one account per phone number, opinions remained split on how effective that countermeasure would really be.
*This article is an excerpt and summary of the 5ch (Nandemo Jikkyo G) thread “Unauthorized access at Yakiniku King, 10.78 million people’s data leaked — nearly all app members affected LOLOLOLOLOLOLOLOLOLOL“
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