Aug 1990 Left INA Co., Ltd. (now Clearia Corporation) Sep 1990 Joined Eight Consultant Co., Ltd. (now Eight Japan Engineering Consultants Inc.) Apr 1992 Manager, Tokyo Office, Eight Consultant Co., Ltd. Jul 1992 Director, Manager of Tokyo Office, Eight Consultant Co., Ltd. Jul 1994 Managing Director, Head of President's Office, Eight Consultant Co., Ltd. Aug 1996 Representative Director, President, Eight Consultant Co., Ltd. Jan 1998 Representative Director, Yakumo Co., Ltd. (current) Jun 2007 Representative Director, President, the Company (current) Aug 2023 Representative Director, Chairman, Eight Japan Engineering Consultants Inc. (current)

Apr 1981 Joined Yakumo Consultants Co., Ltd. (now Eight Japan Engineering Consultants Inc.) Jun 2017 Executive Officer, Head of National Infrastructure Business Division, Eight Japan Engineering Consultants Inc. Jun 2020 Managing Executive Officer, Head of National Infrastructure Business Division, Eight Japan Engineering Consultants Inc. Jun 2021 Director, Managing Executive Officer, Business Management, Eight Japan Engineering Consultants Inc. Jun 2022 Director, Managing Executive Officer, Head of Corporate Planning HQ, Eight Japan Engineering Consultants Inc. Jun 2023 Director, Managing Executive Officer, Head of Corporate Planning HQ and in charge of Administration HQ, Eight Japan Engineering Consultants Inc. Aug 2023 Managing Director, in charge of Administration HQ, Eight Japan Engineering Consultants Inc. Jun 2024 Corporate Auditor, Kyoritsu Engineer Co., Ltd. (current) Aug 2024 Director, Futagami Architects Co., Ltd. (current) Aug 2025 Director, Institute of Meteorological Engineering Co., Ltd. (current) Jul 2026 Director, Head of Business Management HQ, the Company (current)

Apr 1987 Joined Nihon Gijutsu Kaihatsu Co., Ltd. (now Eight Japan Engineering Consultants Inc.) Jun 2014 Head of Geotechnical Engineering Division, Disaster Prevention & Conservation Business Division, Eight Japan Engineering Consultants Inc. Jun 2019 Executive Officer, Deputy Head of Disaster Prevention & Conservation Business Division and Head of Geotechnical Engineering Division, Eight Japan Engineering Consultants Inc. Jun 2020 Managing Executive Officer, Head of Disaster Prevention & Conservation Business Division, Eight Japan Engineering Consultants Inc. Aug 2020 Director, Managing Executive Officer, Head of Disaster Prevention & Conservation Business Division, Eight Japan Engineering Consultants Inc. Jun 2021 Director, Managing Executive Officer, Head of Administration HQ, Eight Japan Engineering Consultants Inc.; Head of Planning HQ, the Company Aug 2021 Director, Head of Planning HQ, the Company (current) Jun 2023 Managing Director, Eight Japan Engineering Consultants Inc. Aug 2023 Representative Director, President, Eight Japan Engineering Consultants Inc. (current)

Jun 2001 Joined Eight Consultant Co., Ltd. (now Eight Japan Engineering Consultants Inc.) Jun 2014 Deputy General Manager, Planning Dept., the Company May 2018 Representative Director, President, Naka Wood Co., Ltd. Jun 2019 General Manager, Corporate Planning Dept., Eight Japan Engineering Consultants Inc.; General Manager, Planning Dept., the Company Aug 2019 Director, Head of Planning HQ, the Company Jun 2020 Executive Officer, Head of Business Promotion HQ, Eight Japan Engineering Consultants Inc. Jun 2021 Director, in charge of Business Management HQ and Planning HQ, the Company Aug 2021 Director, in charge of Internal Audit Dept., the Company Jun 2022 Managing Executive Officer, Head of China Branch, Eight Japan Engineering Consultants Inc. Aug 2022 Director, Managing Executive Officer, Head of China Branch, the Company Aug 2023 Director, in charge of Risk Management, the Company May 2025 Representative Director, President, Enjoy Farm Co., Ltd. (current) Jun 2025 Director, Managing Executive Officer, in charge of Corporate Planning, Eight Japan Engineering Consultants Inc. Aug 2025 Director, Head of CSR HQ, the Company (current) Jun 2026 Director, Head of Corporate Planning HQ, Eight Japan Engineering Consultants Inc. (current)

Apr 1973 Joined Daiwa Securities Co., Ltd. (now Daiwa Securities Group Inc.) May 1998 Manager, Okayama Branch, Daiwa Securities Co., Ltd. Jun 2004 Full-time Audit & Supervisory Board Member, Daiwa Asset Management Co., Ltd. Jun 2008 Executive Adviser in charge of Management Strategy HQ, FinTech Global Co., Ltd. Dec 2008 Full-time Corporate Auditor, FinTech Global Co., Ltd. Dec 2015 Advisor, FinTech Global Co., Ltd. Aug 2016 Director, the Company (current)

Apr 1981 Assistant Professor, Faculty of Engineering, Kyoto University Aug 1987 Assistant Professor, Faculty of Engineering, Okayama University Apr 1999 Professor, Faculty of Environmental Science and Technology, Okayama University Apr 2004 Professor, Graduate School of Environmental Studies, Okayama University Apr 2007 Dean, Graduate School of Environmental Studies, Okayama University Apr 2012 Executive Director, Vice President, and Professor, Graduate School of Environmental Studies, Okayama University Apr 2017 Professor, Graduate School of Environmental Life Science, Okayama University Apr 2020 Professor Emeritus, Okayama University Feb 2021 Professor, Faculty of Business Administration, Vice President, and Director of Regional and Social Cooperation Center, Pacific Rim University (operated by Soshi Gakuen School Corporation) (current) Aug 2021 Director, the Company (current)

Aug 1981 Joined Shinwa Audit Corporation (now Azusa Audit LLC) May 1999 Partner, Asahi Audit Corporation (same) May 2006 Representative Partner, Azusa Audit LLC Jul 2007 Head of Okayama Office (now Okayama Office), Azusa Audit LLC Jul 2020 Opened Nitta Certified Public Accountant Office (current) Aug 2021 Director, the Company (current) Sep 2021 Outside Audit & Supervisory Board Member, Orba Healthcare Holdings Co., Ltd. (current)

Jan 2006 Member, Okayama Prefectural Public Property Council Feb 2007 Member, Okayama Prefectural Fixed Asset Evaluation Council Jul 2007 Representative, Futaba Judicial Scrivener Corporation (current) May 2009 Director in charge of Public Relations, Okayama Prefectural Judicial Scrivener Association Jan 2013 Head, Futaba Registration & Surveying Office (current) Apr 2017 Director in charge of Social Welfare, Okayama Prefectural Judicial Scrivener Association Jan 2021 Representative Director, YJ Corporation Co., Ltd. (current) Aug 2023 Director, the Company (current)

Apr 1980 Joined Nihon Gijutsu Kaihatsu Co., Ltd. (now Eight Japan Engineering Consultants Inc.) Jun 2010 Executive Officer, Deputy Head of Structural Business Division, Eight Japan Engineering Consultants Inc. Jun 2017 Managing Executive Officer, Head of Corporate Planning HQ, Eight Japan Engineering Consultants Inc. Aug 2017 Director, Managing Executive Officer, Head of Corporate Planning HQ, Eight Japan Engineering Consultants Inc. Aug 2019 Director, Managing Executive Officer, Business Management, Eight Japan Engineering Consultants Inc. Jun 2020 Managing Director, Eight Japan Engineering Consultants Inc. Aug 2020 Representative Director, Vice President, Eight Japan Engineering Consultants Inc. Aug 2023 Full-time Corporate Auditor, Eight Japan Engineering Consultants Inc. (current); Full-time Corporate Auditor, the Company (current) Aug 2025 Corporate Auditor, Futagami Architects Co., Ltd. (current)

Oct 1998 Principal, Matsubara Certified Public Accountant Office (current) Aug 2000 Corporate Auditor, Eight Consultant Co., Ltd. (now Eight Japan Engineering Consultants Inc.) Jun 2007 Corporate Auditor, the Company (current)

Apr 1984 Registered as attorney-at-law, joined Nishida Law Office Apr 1988 Opened Usami Law Office (current) Aug 2019 Corporate Auditor, the Company (current)