Choose SEO agencies in Tokyo by the audience they can reach, the website changes they will deliver and the evidence they will report - not simply by a Tokyo address or a "best agency" badge. For a bilingual project, compare Japanese research and editorial responsibility alongside English account management, then give shortlisted firms the same brief.

Search engine optimisation, or SEO, should help the right people discover and use your website through unpaid search results. The useful buying question is therefore not "Who promises the most traffic?" It is "Who can explain how their work will bring the customers this business actually needs?"

Decide whether your market is Tokyo, Japan or overseas visitors

Write down the customer before requesting proposals. A Tokyo clinic seeking nearby residents, a retailer selling throughout Japan and a tour operator targeting English-speaking visitors have different assignments. Treat those as three distinct briefs, even when all three businesses have Tokyo offices.

For a local service, ask how the agency will connect relevant area searches with the correct location page and a useful enquiry route. For national ecommerce, ask how it will prioritise categories, product information and the customer journey. For inbound tourism, require a distinction between people planning abroad and people already in Japan.

Specify the languages that customers read, not merely the language you prefer for meetings. Ask who researches Japanese queries, who writes the pages and who approves specialist terminology. A bilingual salesperson is not evidence that the assigned writer understands your product.

A useful first brief names the target audience, priority products or services, website platform, languages, desired customer action and internal development capacity. Include the pages that matter most. This gives agencies enough information to propose a sequence of work instead of sending an interchangeable monthly package.

Three agencies to investigate for different needs

These are examples supported by their own service descriptions, not an independently tested league table. The comparisons below identify questions worth asking; they do not establish which team will perform best for your business.

Humble Bunny lists SEO alongside localisation and conversion optimisation in its Tokyo-based services. That makes it a candidate to investigate when search visibility and the quality of Japanese landing pages need to be addressed together. Ask whether the proposal includes rewriting and implementing those pages or only advising your existing team. 1

Its contact instructions also resolve a practical point: initial enquiries should go through email or the contact form, rather than an unsolicited telephone call; a call can then be arranged. Use that first message to send the brief and request the relevant specialist, not just a general sales presentation. 2

Principle describes technical SEO work on crawling problems and bilingual website coverage, with attention to the relationship between organic and paid search. Its service navigation also includes analytics work. Consider it for a shortlist when the assignment involves technical investigation and measurement as well as content. These are advertised capabilities, not an assurance about a particular proposed team. 3

Ask Principle, or any technically focused bidder, to explain how recommendations reach production. A useful answer identifies who changes templates, who approves releases and how completed changes are tested. An audit document and an implemented improvement are different deliverables.

Zo Digital Japan publishes a Tokyo business address in Nishi Shimbashi and describes English- and Japanese-language services spanning SEO, content marketing, digital public relations, analytics and reporting. It is a relevant candidate for a bilingual brief that combines search work with content and measurement. Ask which of those activities are included, subcontracted or separately priced. 4

Do not interpret an office listing as an invitation to arrive without an appointment. For every candidate, confirm who will attend the proposal meeting and whether that person will remain involved after the contract starts.

Compare completed work, not package names

Ask every shortlisted agency to price the same initial scope. Separate discovery, technical implementation, Japanese editorial work and ongoing reporting. A cheaper quotation can simply leave the development or writing to you.

For example, imagine one proposal includes a technical audit and four content briefs, while another includes the audit, fixes to agreed templates and four edited pages published on the site. Those are not equivalent offers. Request a responsibility table before comparing the totals; otherwise your own team's time disappears from the comparison.

Make acceptance criteria concrete. A page assignment should identify the audience, topic, language, approval process and publication responsibility. A technical task should specify the affected templates, the expected change and the evidence used to confirm it. Avoid paying for a volume of recommendations without knowing which ones the agency will help execute.

Ask for a sample report and a relevant case study. Read the period, starting point, market, language and scope together. A traffic chart is less persuasive when it mixes a new paid campaign, a major brand launch and SEO changes without explaining the different contributions.

Rather than demanding a precise ranking deadline, set an initial review point around agreed delivery milestones. The question at that review should be whether the diagnosis was credible, the agreed work was implemented and the measurement is usable - not whether an arbitrary keyword briefly appeared in one screenshot.

Require reporting that separates visibility from business results

Google Search Console provides search clicks, impressions, click-through rate and average position, with breakdowns including queries, pages, countries and devices. Those dimensions allow more useful discussion than an undifferentiated total traffic number. 5

Ask for reporting on the relevant page groups and target countries. Review brand-name searches separately from searches by people who may not know the business. For a bilingual site, agree how the Japanese and English page sets will be compared; do not let a rise in one hide a problem in the other.

Then connect the agreed audience to a meaningful business action: a qualified enquiry, completed reservation or purchase. Require an explanation of what is measured and what is not. A contact-button click, a submitted form and a confirmed customer should not quietly become the same metric.

Keep administrative control of the website and measurement accounts within your business. Give the agency the access needed for its work, document changes and agree how access will be removed at handover. This is a practical safeguard against losing continuity when suppliers or staff change.

Treat AI visibility as a scope question, not a guarantee

An "AI search" service should explain its actual activities and evidence. For Google's AI Overviews and AI Mode, Google's guidance says normal SEO fundamentals remain relevant, with no additional special optimisation required. A supporting page must be indexed and eligible for a search snippet; inclusion is not guaranteed. Google also says there is no special schema or AI text file required for these features. 6

That does not make every service with an AI label worthless. It means a proposal should identify useful work - such as fixing inaccessible content, strengthening important pages or improving clear factual information - rather than treating a renamed package as a technical requirement.

Google's documentation also places traffic from these AI features within Search Console's overall Web search reporting. Ask a bidder to explain how any claimed AI-specific result is measured and where uncertainty remains. Do not assume a dashboard heading proves a separately attributable source of revenue. 6

Before signing, obtain the named team, language responsibilities, included implementation, reporting examples, payment stages and handover terms in one written scope. Choose the agency that makes those commitments intelligible and relevant to your business, rather than the one offering the broadest promise.

Sources