Square One | Zagdim Global Experts
Tokyo, Japan

Square One

スクエアワン司法書士法人
Legal form
Judicial scrivener corporation (shihō-shoshi hōjin)
Location
Tokyo, JapanVerified by Zagdim · 12 Nov 2026
Services
Company formation, changes to company registration, property registration, inheritance and estate planningStated by the firm

Suited toIndividuals and companies that need to set up a company in Japan or amend a company registration, and can work in Japanese.

Ask firstWhether the firm can work in English, whether it acts for clients who live abroad, and how it charges.

Whether the firm can take on a particular case is for the firm to confirm.

Corporate registrationJudicial scrivener corporation, Tokyo Shiho-Shoshi Association (Japan Federation of Shiho-Shoshi's Associations)Verified by Zagdim · 12 Nov 2026Corporate number3011005003538 (National Tax Agency)Verified by Zagdim · 12 Nov 2026See registration and sources ›
How to read this profileVerified by ZagdimChecked by Zagdim against the official source, with the dateStated by the firmSupplied by the firm or the professionalWhat verification means ›
Public-record profileCompiled by Zagdim from the official register and the firm's own website. The firm has not yet reviewed it.Is this your firm? Correct or claim it ›
01

About the firm

Square One (スクエアワン司法書士法人) is a Japanese judicial scrivener corporation with its main office in Hiroo, Shibuya-ku, Tokyo. A shihō-shoshi, or judicial scrivener, is the licensed professional who files company and property registrations in Japan. The firm publishes no English name; “Square One” is a transliteration. It is on the register of the Japan Federation of Shiho-Shoshi's Associations as a corporation belonging to the Tokyo association, and its National Tax Agency corporate number is 3011005003538. According to the corporate number record it took its present name in May 2022; before that it was 司法書士法人石川和司事務所.

The register lists nine judicial scriveners: one representative partner, two partners and six employed scriveners. According to the firm's website it was established in 2011 and handles company formation, amendments to company registrations, property registration, and inheritance and estate planning. The same group includes a labour and social security attorney corporation and a land and house investigator corporation; when a company is set up, social insurance filings are handled by the group's labour and social security firm.

Zagdim wrote this summary from the information set out below.
Verified by Zagdim · 12 Nov 2026 · official registerCorporate registration, corporate number, main office, change of name, number of scriveners on the register
Stated by the firmYear established, services, division of work within the group

Banner from the firm's website showing its logo and name, スクエアワン司法書士法人
Banner from the Square One group website | From the firm's websitePhoto: Square One group website. The image belongs to the firm and is used to identify it; cropped to fit.
Type
Judicial scrivener corporation (shihō-shoshi hōjin)
Founded
2011
Offices
Tokyo (main office, Hiroo, Shibuya-ku)
Languages
Japanese (the website is in Japanese only)
Team
Nine judicial scriveners on the register: one representative partner, two partners and six employed scriveners
Website
square1.jp
02

Registration and legal identity

RegistrationRegistryStatusChecked onSource
Judicial scrivener corporationThe public register does not show a registration number for corporations. The 13-digit corporate number in the next row rules out firms of the same name.Japan Federation of Shiho-Shoshi's AssociationsOn the register, as a member of the Tokyo Shiho-Shoshi Association. Main office: 1-3-18 Hiroo, Shibuya-ku, Tokyo12 November 2026The federation's search for judicial scriveners and corporations (register data updated 10 November 2026)
Corporate numberCorporate number 3011005003538, the 13-digit number issued by the National Tax Agency.National Tax Agency of JapanListed on the publication site. Registered name: スクエアワン司法書士法人. Main office: 1-3-18 Hiroo, Shibuya-ku, Tokyo. Renamed on 6 May 2022; the earlier name was 司法書士法人石川和司事務所12 November 2026National Tax Agency, Corporate Number Publication Site

A Zagdim check confirms that the entry exists and what it showed on the day we looked. It is not an endorsement by the regulator, and it does not mean the firm is right for every case. Where the official source gives no information, we write “not stated by this source”. What verification means

03

Services, coverage and languages

  • Company formation
    Helps draft the articles of incorporation, prepares the documents for the Legal Affairs Bureau and files the application to register the company.
  • Changes to company registration
    Files the amendment when anything recorded on the company register changes.
  • Property registration
    Registration when an individual or company buys real estate, and later changes to the entry.
  • Inheritance and estate planning
    Division of estates, wills and family trusts.
Offices
Tokyo (main office, Hiroo, Shibuya-ku)Verified by Zagdim · 12 Nov 2026 · official register
Languages
Japanese (the website is in Japanese only)

Stated by the firmServices, area covered and languages

04

Sources and upkeep

Last verified
12 November 2026
Next review
by 12 November 2027

Sources

  • Search for judicial scriveners and corporations, Japan Federation of Shiho-Shoshi's Associations (checked 12 November 2026)Official source
  • National Tax Agency, Corporate Number Publication Site (checked 12 November 2026)Official source
  • The Square One group website, square1.jp (read 12 November 2026)Stated by the firm

How profiles are built and how often they are reviewed: How Zagdim builds and maintains the directory | What verification means

Worked with Square One? Share your experience

Clients, colleagues and peers are all welcome to write. There are no star ratings. Before anything is published, Zagdim verifies it and asks for your consent.

The Zagdim Reader Desk squirrelNot sure where to start?Tell us your situation

Zagdim Reader Desk

If you need help, tell the Zagdim Reader Desk about your situation. This firm does not yet have a working relationship with Zagdim. We can put your question to the firm on your behalf, or introduce a professional we already work with. Fees, engagement terms and payment are settled directly between you and the firm.

  • A reply within 24 hours, as a rule.
  • No documents needed. Describe your situation as fully as you can; the more we know, the better we can assess it.
  • The Reader Desk is free. The firm quotes its own fees.

Ask Zagdim on WhatsAppEmail the Reader Desk

How Zagdim builds and maintains the directory  What verification means  Privacy

Please note

Zagdim compiled this profile from public sources. We checked the official registration ourselves on the register; everything else comes from the firm's website and is marked as such. The firm took no part in writing it, and the profile does not mean the firm works with Zagdim. This is not a complete list of the market: absence from it says nothing about a firm's qualifications and is not a negative view from Zagdim. If something is wrong, or you want to update, claim or remove a profile, tell Zagdim.