Cybersecurity 2026

JAPAN Trends and Developments

Trends and Developments Contributed by: Yasushi Kudo, Yukiko Konno and Takayuki Inukai Nagashima Ohno & Tsunematsu

Nagashima Ohno & Tsunematsu is based in Tokyo, Japan, and is widely recognised as a leading law firm and one of the foremost providers of international and commercial legal services. The firm’s overseas network includes locations in New York, Shanghai, Singapore, Bangkok, Ho Chi Minh City, Hanoi, Jakar - ta (associate office) and London. The firm also main - tains collaborative relationships with prominent local law firms. In representing its leading domestic and international clients, it has successfully structured

and negotiated many of the largest and most signifi - cant corporate, finance and real estate transactions related to Japan. In addition to capabilities spanning key commercial areas, the firm is known for path- breaking domestic and cross-border risk manage - ment/corporate governance cases and large-scale corporate reorganisations. The firm’s over 600 law - yers work together in customised teams to provide clients with the expertise and experience specifically required for each client matter.

Authors

Yasushi Kudo is a partner at Nagashima Ohno & Tsunematsu. He mainly focuses on crisis management, including dealings with domestic and international authorities, regulatory compliance, cybersecurity/data

Takayuki Inukai is an associate at Nagashima Ohno & Tsunematsu. His practice primarily focuses on technology, media, and telecommunications (TMT) including data privacy, cybersecurity,

privacy, and advice on compliance systems and corporate governance, leveraging his expertise and experience gained from secondment to the Financial Services Agency and the Securities and Exchange Surveillance Commission. Recently, his focus has been on legal issues raised by cybersecurity incidents such as ransomware attacks, data compromise and business e-mail compromise, as well as the development of internal control systems to mitigate cybersecurity risks such as supply chain risk.

telecommunications regulation, and intellectual property. He provides advice in various situations, utilising his technical expertise. He is a graduate of the Department of Computer Science and Engineering, Waseda University in 2018 (Bachelor of Engineering). He was seconded to the Telecommunications Bureau and Information and Communications Bureau of the Ministry of Internal Affairs and Communications (MIC) (2022-24).

Yukiko Konno is a counsel at Nagashima Ohno & Tsunematsu. Her practice primarily focuses on domestic and global data governance and other emerging areas, including cybersecurity, data privacy/data

protection, AI and IoT issues, as well as cross- border general corporate matters across a range of industry sectors. She is a graduate of Keio University (2005), Chuo Law School (JD, 2008) and Columbia Law School (LLM, 2015). She was seconded to a private trading company (2015–17) and the Trade Policy Bureau of Ministry of Economy, Trade and Industry of Japan (METI) (2019-22).

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