Electronic Manga App "Piccoma" Leaks About 1 Million Customer Email Addresses | NHK News

What happened

The company that runs Piccoma, an app for electronic comics, announced the leak on October 25, 2026. Piccoma uses an outside company to send emails to its users. That outside company was broken into by someone who should not have had access. As a result, about 1 million customer email addresses were leaked.

Key numbers and facts

• About 1 million (100万件) email addresses were leaked.
• The announcement was made on October 25, 2026, at 17:49 Japan time.
• The cause was unauthorized access (someone breaking into a system without permission).
• The breach was at a company that Piccoma uses to send emails, not at Piccoma itself, according to the report.

Some background

Piccoma is a popular Japanese app where people read comics on their phones. Many companies today hire other firms to handle tasks like sending emails. If one of these partner companies has weak security, a hacker can get into the data of many customers at once. This is called a supply chain attack.

Why it matters

Email addresses may seem small, but they can be used for scam emails and fake messages. People who get strange emails claiming to be from Piccoma should be careful. Companies should also check the security of the other companies they work with.

What to watch

• Whether Piccoma explains more about how the attack happened.
• Whether the outside email company is named or makes its own announcement.
• Whether users receive warnings about scam emails.