A spate of cyberattacks that has rocked Japan Inc. in recent weeks is alarming not because of some novel artificial intelligence hacking methods, but the sheer scale.The head of the ruling Liberal Democratic Party’s cybersecurity body went so far as to describe it as a “state of emergency in cyberspace.” Brokerage firm Daiwa Securities Group, SoftBank’s cloud subsidiary IDC Frontier, railway operator JR East, convenience-store chain Lawson, car-rental platform Times and even a major karaoke operator and grilled meats restaurant chain have all been affected. It’s been hard to keep track of the barrage of incidents.Publicly disclosed breaches, mostly impacting customer data, through September surpassed the total for all of last year, according to Tokyo-based cybersecurity firm Trend Micro. And while ransomware attacks globally slid by 3% between July 2025 and June 2026, according to Microsoft’s Digital Defense Report published this month, they surged 67% in Japan. This is likely only the tip of the iceberg.
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