Aflac Life Insurance Japan has disclosed a major data breach affecting 4.38 million customers after hackers accessed their systems between June 15th and 25th. The stolen information includes names, addresses, phone numbers, dates of birth, and insurance account details, with banking information for about 230,000 people also compromised, though credit card data remained secure. The incident has disrupted at least five company services, with no estimated timeline for restoration, and only affects Aflac's Japan operations, not its US business.