Koyanagi worked for Deloitte in accounting auditing and business restructuring for securities firms. He was then seconded to the Corporate Planning Department of Sony Corporation. He later worked as the Deputy General Manager of Business Administration Division and General Manager of Accounting Department of UCC Holdings Co., Ltd., and Director, General Manager of Business Administration Department of Seven Dreamers Laboratories Co., Ltd. He has served as General Manager of O2 Inc.’s Finance Division and General Affairs Division. In April 2022, he joined the management of TRADOM Inc.

Keio University, Faculty of Policy Studies (B.A. 1999)