The team of Plus One Service Co., Ltd./Takigawa Tax Accountant Office specializes in accounting, payroll calculation, social insurance, and legal procedures, such as business registrations and tax conventions between Japan and other countries. We challenge ourselves to be our clients’ best partner in business on any given day.

Representative Director

Yoshikazu Takigawa

Worked for a Swedish company in Japan for 28 years and gained experience predominantly in accounting, logistics, and personnel management. He initiated the establishment of Plus One Service Co., Ltd. in 1993 as its Representative Director.

Taku Terao

Started his career at a Japanese tax office. After gaining a year’s experience, he joined Plus One Service Co., Ltd. in September 2002. He is in charge of accounting and all other services for both Japanese and international clients. He was registered as the representative director as a successor to Yoshikazu Takigawa in October 2016.

Certified Public Tax Accountant

Hisako Takigawa (Certified Tax Accountant)

Co-founded Plus One Service Co., Ltd. and Takigawa Tax Accountant Office together with Yoshikazu Takigawa. With seven years’ experience at an international law office and over 10 years’ experience working for foreign-affiliated companies (U.S. and Swedish) in Japan, her knowledge and deep understanding of the business activities of foreign-affiliated companies in Japan gives Plus One Service Co., Ltd. an edge.

Senior Staff

Hiroaki Yui 

After achieving a master's degree and passed some subjects of the tax accountant exams, he started working at Plus One Service Co., Ltd. in October 2017.

Tomoka Seki

Joined Plus One Service Co.,Ltd in 2015. She passed some of the tax accountant exams including Consumption Tax, Inheritance Tax and has continued the study, aiming to be a certified tax accountant.


Rui Sato

Over 15 years, she worked in multinational companies to support all-around type of tasks such as accounting, general affairs and human resources as a bridge between Japan and overseas offices. She continues developing those professional skills and knowledge to provide clients the best solutions.

Megumi Taiji

With 10 years' experience in Human Resources and Administrative Support at an international firm, she joined Plus One Service to broaden her knowledge and experience. 
She strives to support her clients with her sincerity and care.

Ayako Hashimoto

After having worked as an accountant at other accounting firms, started working at Plus One Service Co., Ltd. since November 2014. Currently, her role is to assist senior accountants by engaging in various works. She is determined to do the best to develop her expertise as an accountant to be of any help for our clients.

Kotone Iwamoto

After having experiences in accounting and general affairs, she joined this company where she can utilize her experience extensively. She will make her effort to support clients according to their needs.

Toru Inagaki

Joined Plus One Service seeking an further opportunity in international accounting.
He passed some of the tax accountant exams while previously working in accounting firms and now ready to make every effort to deliver satisfaction to clients.