A 15-year-old high school student in Japan has been arrested for allegedly using ChatGPT to help develop software used in a cyberattack on Bandai Namco Filmworks' Bandai Channel streaming service, which disrupted operations and forced the cancellation of more than 46,000 user accounts. According to reports citing the Tokyo Metropolitan Police, the teenager is suspected of fraudulent obstruction of business after allegedly exploiting a vulnerability in the anime streaming platform in November 2025. Investigators claim he used ChatGPT to assist in writing a program that automated unauthorised access to member accounts, resulting in the cancellation of 46,812 subscriptions. Police allege that on November 4, 2025, the teen sent fraudulent commands to Bandai Channel's servers, triggering the mass deregistration. The attack disrupted services beginning November 6, with full operations resuming in December. Authorities allege the teen changed his IP address about 30 times to continue sending malicious commands. The suspect, who was a junior high school student at the time, had already been arrested in June this year for other computer-related offences. He told investigators he had "no grudge" against Bandai Namco Filmworks and targeted the platform because "there were many accounts I could log into." Bandai Namco Filmworks said there is no evidence that leaked data has been published online or misused.