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The story
Daiki Suisan, a sushi chain based in Sakai City, announced on October 6 that personal information belonging to roughly 175,000 customers who registered through its official app between November 2024 and September 15, 2026 may have been leaked due to unauthorized access to the app’s system. The data potentially exposed includes names, phone numbers, and addresses; no misuse has been confirmed so far. On the thread, some speculated the timing of the announcement was chosen so it would slip by unnoticed amid other companies’ major breaches, while others repeatedly questioned why a restaurant chain was holding onto customers’ personal information in the first place.
Daiki Suisan announces possible leak of personal data for about 175,000 people — unauthorized access confirmed on official app system — no misuse confirmed at this time
Amid a wave of unauthorized access incidents hitting companies, Daiki Suisan, a sushi chain in Sakai City, Osaka Prefecture, announced that it may have suffered a leak of personal information for 175,000 people following unauthorized access.
According to Daiki Suisan, unauthorized access to its official app system was confirmed on September 15. Personal information — including names, phone numbers, and addresses — of roughly 175,000 customers who registered via the official app between November 2024 and September 15 may have been leaked, though no misuse has been confirmed so far.
Source: news.yahoo.co.jp / Original article here
What people said
To keep it murky exactly where the leaked info ended up getting misused
Big names like Times (car sharing) and Monogatari (restaurant chain) already screwed up, so if you dump your announcement in with theirs, it gets lost in the crowd.
Nobody's paying attention right now, so this is our chance to sneak the announcement out in the chaos!
What is even going on
It's a threat from China and Russia
"Do what we say or we'll hurt you worse"
With AI, literally anyone can hack now
Feels like companies are hoarding way more personal data than they actually need
Guess that rules out 5ch for you too, then
Probably for coupons and reservations or something
Once you're online at all, it's the same risk either way
Otsuka Floppy (a nonsense riff off the previous joke)
Some company went and built an AI model specialized for vulnerability testing. If they'd released a matching defense model alongside it, this wouldn't be happening…
There probably is one
They'll probably market it as "only Mythos can protect you from Mythos" or something
It leaks constantly
I haven't registered anywhere myself, but like, when you bring stuff into a secondhand shop to sell, they check your driver's license and type your details in by hand.
They used to just scan it with a machine before — that's dangerous too, if you think about it.
Most of this is organized
Some are private hacker groups, some are state-backed
If it's a nation-state, there's not much you can do against an IT/AI superpower like China
Their IT units run AI built for their own country, take orders, are well-trained, loyal, and won't hesitate to attack Japan
That one looks pretty shaky too though
Yeah, that's why I even pay for stuff like Amazon via convenience-store payment. I never use my credit card online.
This whole simultaneous-attack spree, I mean
If the vendor's master key leaked
The damage is only going to keep growing from here
Same company, huh
Or just a lot of companies leaving security holes unpatched
Unauthorized access to US Department of Defense personnel database — personal data of over 3 million people possibly viewed, reports say
https://news.yahoo.co.jp/articles/ca23a056b53ed4a5183c4b464f9c438487617d23
In Denmark, 8.8 million national ID numbers leaked — including those of deceased citizens —
more than the country's entire population
https://ufm.dk/aktuelt/pressemeddelelser/2026/oktober/omfattende-uautoriseret-adgang-til-borgeres-cpr-oplysninger/
Every country has leaks, but you don't normally see this many private companies hit all at once in such a short span
Japan is clearly being targeted right now
They're probably not managing it in-house at all
They outsource it, so they wouldn't notice no matter what happened
Should've trained up the "Lost Generation" properly while they were still young. (Japan's employment ice-age generation, who struggled to land stable jobs)
The IT industry only cares about quick money
Seriously, this
Once all the weak-security companies get picked off, the real fight — AI vs. the companies with strong security — is going to start
Net users have been saying for 20 years now that once everything goes digital, cyberattacks would get more sophisticated lol
The government just hasn't caught up with the times lol
Background and talking points
Under Japan’s Personal Information Protection Act, a business facing a possible data leak is required to notify affected individuals and report to the Personal Information Protection Commission, and this announcement falls within that framework. On the thread, opinions were split: some suspected the company picked this moment because it would get lost amid a string of recently disclosed breaches at major companies like Times (car sharing) and Monogatari Corporation (restaurant chain), while others argued the attacks are simply clustering around the same period by coincidence. Commenters also pointed out that similarly large-scale leaks have been reported overseas, including at the US Department of Defense’s personnel database and in Denmark’s national ID number system, suggesting this isn’t a problem unique to Japan. One thing worth noting: an announcement that data “may have” leaked doesn’t mean misuse has actually happened — and Daiki Suisan itself says no misuse has been confirmed at this time.
*This article is excerpted and summarized from the 5ch (News Speed+) thread “Sushi chain “Daiki Suisan” announces possible leak of personal data for about 175,000 people.”
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