A 15-year-old student in Japan has been arrested after allegedly using ChatGPT to help write software that authorities say was used in a cyberattack on Bandai Namco Filmworks’ Bandai Channel streaming platform. The incident, which reportedly resulted in the cancellation of more than 46,000 user accounts, is drawing attention not only because of the suspect’s age but also because it highlights the growing role of generative AI in software development—and the risks that come with it.

The case also underscores an important distinction: AI tools like ChatGPT can assist with coding, but responsibility for how that code is used ultimately rests with the user. As AI-powered programming assistants become more common, law enforcement agencies and technology companies are increasingly grappling with how these tools fit into investigations involving cybercrime.

TL;DR

• A 15-year-old Japanese student has been arrested over an alleged cyberattack on Bandai Channel.
• Police claim he used ChatGPT to help rewrite code that automated unauthorized account access.
• The attack reportedly led to the cancellation of 46,812 user accounts and disrupted the anime streaming service for nearly a month.
• Authorities allege the suspect repeatedly changed IP addresses after his access was blocked.
• The incident highlights both the accessibility of AI coding assistants and the importance of cybersecurity safeguards.

What Happened in the Bandai Channel Cyberattack?

Japanese authorities allege that the teenager exploited a vulnerability in Bandai Channel, an anime streaming platform operated by Bandai Namco Filmworks, in November 2025.

According to investigators, the suspect developed software that automated unauthorised access to user accounts and triggered mass account cancellations. Police say fraudulent commands were sent to the platform’s servers on November 4, causing widespread disruption.

The company reportedly experienced service outages beginning on November 6, with full restoration not taking place until December after repairs were completed.

Authorities say the attack resulted in:

• Cancellation of 46,812 user accounts
• Temporary suspension of parts of the streaming service
• Significant operational disruption
• Refunds issued to affected subscribers
• Individual notifications warning users about phishing attempts

Bandai Namco Filmworks has stated that there is no evidence the leaked account information has been published online or otherwise misused.

How Was ChatGPT Allegedly Used?

One aspect of the investigation attracting global attention is the alleged use of ChatGPT.

According to statements attributed to the suspect during questioning, he initially wrote the software himself but turned to ChatGPT because the process was taking too long.

He reportedly told investigators:

“I created the source code for the withdrawal process myself. Since the processing was taking a long time, I asked ChatGPT and completed it in a different programming language.”

This is an important distinction.

Authorities are not alleging that ChatGPT conducted the attack. Instead, investigators claim the AI chatbot was used as a programming assistant to help rewrite or optimize code that the suspect later used in the alleged cyberattack.

Generative AI systems have become widely used by software developers for tasks such as:

• Translating code between programming languages
• Explaining programming concepts
• Debugging software
• Writing repetitive code
• Improving efficiency during development

Those same capabilities can potentially be misused if someone intentionally develops malicious software.

How Investigators Say the Attack Was Carried Out

Police allege the teenager first discovered a vulnerability in the streaming platform before exploiting it to gain unauthorized access.

Investigators further claim that after Bandai Channel blocked his access, he changed his IP address approximately 30 times to continue sending malicious commands.

Authorities say these actions demonstrate deliberate attempts to bypass the company’s security measures.

The suspect reportedly admitted that he had no personal grievance against Bandai Namco Filmworks.

Instead, investigators say he explained his motivation simply as:

“There were many accounts I could log into.”

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The teenager also told police he began using computers in fourth grade and taught himself programming while still in elementary school.

Why This Case Matters Beyond One Cyberattack

The case is significant because it reflects several broader trends happening simultaneously.

AI Coding Tools Are Becoming Mainstream

AI-assisted programming is no longer limited to professional software engineers.

Students, hobbyists, startups, and experienced developers increasingly rely on AI to:

• Write code faster
• Learn new programming languages
• Solve technical problems
• Generate boilerplate code

That accessibility lowers barriers for both legitimate innovation and potential misuse.

Young Hackers Have Access to Powerful Tools

Historically, sophisticated cyberattacks required years of programming experience.

Today’s landscape is different.

AI coding assistants, freely available programming tutorials, and open-source software make advanced technical knowledge easier to acquire than ever before.

Experts caution, however, that AI does not replace technical skill. Users still need to understand how to identify vulnerabilities, deploy software, and execute attacks.

Companies Face Growing Security Challenges

The Bandai Channel incident illustrates why organisations increasingly prioritise:

• Vulnerability testing
• Multi-layer authentication
• Intrusion detection
• Rate limiting
• Security monitoring
• Rapid incident response

Even relatively simple vulnerabilities can have major operational consequences if exploited at scale.

What Did Bandai Namco Filmworks Do After the Incident?

Following the breach, Bandai Namco Filmworks implemented several response measures.

The company:

• Contacted affected customers individually
• Asked cancelled members to re-register
• Warned users about phishing and impersonation emails
• Issued refunds for subscription fees during the disruption
• Investigated the security incident
• Reported the case to police

In a public statement, the company said there is currently no evidence that leaked information has appeared online or been misused.

Bandai Namco Filmworks also said it would continue conducting regular security checks to reduce the likelihood of similar incidents occurring again.

Does This Mean AI Is Responsible for Cybercrime?

Not necessarily.

The case illustrates a broader reality about generative AI: it is a tool.

Like calculators, search engines, or programming software, AI can be used for productive purposes—or misused.

Millions of developers rely on AI every day to write legitimate applications, improve software quality, and learn programming skills.

Technology companies have introduced safeguards intended to reduce assistance with malicious requests. However, no automated system can completely eliminate misuse, particularly when users already possess technical knowledge.

For cybersecurity professionals, the challenge is increasingly shifting from whether AI exists to how organizations adapt their defenses in an environment where attackers can develop software more quickly.

The Investigation Is Still Ongoing

The teenager had reportedly already been arrested in June this year in connection with other computer-related offenses before the latest allegations emerged.

Japanese police have accused him of fraudulent obstruction of business, and the investigation remains ongoing.

As with any criminal case, the allegations have been made by investigators, and legal proceedings will ultimately determine responsibility.

Regardless of the outcome, the incident is likely to become part of a broader discussion about AI-assisted programming, cybersecurity education, and the responsibilities that come with increasingly accessible development tools.

Why This Story Matters

The Bandai Channel case represents more than a single alleged cyberattack.

It reflects the convergence of three rapidly evolving trends:

• AI-powered software development becoming commonplace.
• Young programmers gaining access to increasingly sophisticated tools.
• Organizations facing growing pressure to identify and patch vulnerabilities before attackers can exploit them.

Rather than demonstrating that AI creates cybercriminals, the incident highlights how modern technology can amplify both legitimate software development and malicious activity, depending on how it is used.

As AI continues to reshape programming, cybersecurity experts expect incidents like this to fuel renewed discussions about digital literacy, responsible AI use, and stronger security practices across the technology industry.