6 Best SEO Agencies in Japan (2026)
We reviewed SEO agencies in Japan and ranked them on search engine optimisation, published review scores and evidence of real client work. Tokyo holds almost all of them, concentrated in Minato, Shibuya and Shinagawa wards, with one headquartered in Osaka. Every agency below shows this service on its own site.
Reviewed by Davis Paipa, Founder, Shoptank. Agency data verified 2026-09-17.
| # | Agency | Best for | Location | Rating |
|---|---|---|---|---|
| 1 | Faber Company | Tool-backed SEO and GEO | Tokyo, Japan | Not published |
| 2 | PLAN-B | Enterprise SEO with AI visibility | Osaka and Tokyo, Japan | Not published |
| 3 | CINC | Data-driven AI search monitoring | Tokyo, Japan | Not published |
| 4 | Digital Identity | Full funnel digital marketing teams | Tokyo, Japan | Not published |
| 5 | Sakurasaku Marketing | Regulated industry SEO and LLMO | Tokyo, Japan | Not published |
| 6 | LANY | Startups scaling SEO and LLMO | Tokyo, Japan | Not published |
Faber Company
Faber Company is a Tokyo digital marketing technology provider headquartered in Toranomon, Minato Ward, and listed on the Tokyo Stock Exchange Standard Market since July 2024. It combines its own product family with consulting services covering SEO, GEO and LLMO, conversion work, content marketing and analytics.
Faber Company runs a named GEO and LLMO consulting practice plus a dedicated measurement product that visualises how often a brand is recommended and cited inside AI search results. Its company outline lists establishment in October 2005 and 80 employees as of September 2025.
You want AI search visibility measured with a vendor-owned tool rather than estimated from spreadsheets.
- Publicly listed company with a published company outline, capital and headcount
- GEO consulting page cites optimisation for ChatGPT and Gemini and draws on over 1,000 prior cases
- Its SEO platform is stated to be used by 1,900 companies, giving the consulting team a large data set
- The consulting practice is closely tied to its own product family, so engagements may assume tool adoption
- No pricing or minimum engagement is disclosed on the GEO and LLMO consulting page
PLAN-B
PLAN-B is a digital marketing company with headquarters in Nishi Ward, Osaka and a second head office in Shinagawa Ward, Tokyo. Its business spans digital marketing services, a marketing technology product line including a content SEO tool, and social commerce support.
The SEO consulting page publishes plan pricing openly, from 500,000 yen per month on a six month term, and states a 19 year SEO track record with a 95.3 percent client continuation rate. PLAN-B also sells LLMO consulting and an AI brand awareness survey that analyses how generative AI systems describe a brand.
You need a long-established Japanese SEO team with published retainer pricing and an AI search add-on.
- Publishes tiered SEO pricing including a one month strategy design engagement and per-article writing rates
- Company page states establishment in October 2003 and 265 staff including group companies as of December 2025
- Named client results are shown on the SEO consulting page
- SEO consulting plans require a minimum six month commitment
- The company also runs social commerce and influencer businesses, so search is one unit among several
CINC
CINC is a Tokyo marketing technology company based in Toranomon, Minato Ward, operating a solution business, an analytics consulting business and a corporate brokerage arm. It describes itself as an AI-first communication company and builds its services around proprietary data platforms.
CINC sells AI search optimisation consulting labelled GEO, LLMO and AIO alongside conventional SEO consulting, and backs it with two products: an SEO and GEO platform, and a tool that continuously tracks a brand's mention share inside generative AI answers. The company page lists establishment in April 2014 and 114 consolidated employees as of October 2025.
You want continuous measurement of your share of AI answers, not just a one-off GEO audit.
- Runs a dedicated AI mention monitoring product rather than relying on manual prompt checks
- Offers a specialised AI search track for recruitment, a vertical few agencies break out
- Publishes substantial educational material on GEO, llms.txt and AI search behaviour
- Marketing is one of three divisions, so search is not its sole focus
- No pricing is published for SEO or AI search optimisation consulting
Digital Identity
Digital Identity is a digital marketing agency headquartered in Shibuya Ward, Tokyo, with additional offices in Fukuoka and Sapporo, operating under a listed parent company. Its service range covers SEO, digital advertising, web production, content marketing, analytics, conversion work, social and PR.
Its LLMO service page is unusually specific, naming ChatGPT, Gemini, AI Overviews and AI Mode as targets and describing structured data implementation, semantic HTML work and experience-focused content rewriting. The same page publishes a price floor of roughly 600,000 yen per month with a six month minimum contract.
You want AI search work delivered alongside paid media, analytics and development by one large in-house agency team.
- Publishes a clear price floor and contract term for its AI search service, rare among Japanese agencies
- Company page lists 417 employees as of April 2024, plus Fukuoka and Sapporo offices
- Can pair AI search work with in-house development, so schema and semantic HTML changes are implemented rather than only recommended
- At over 400 staff the engagement is unlikely to be founder-led or boutique in style
- The LLMO service requires a six month commitment at a 600,000 yen monthly floor, which rules out small budgets
Sakurasaku Marketing
Sakurasaku Marketing is a search marketing consultancy with its head office in Shibuya, Tokyo and a branch office in Osaka. It describes itself as an AI and SEO professional partner and sells SEO consulting, LLMO consulting, conversion consulting, site production, article production and second opinion audits.
Its LLMO consulting page sets out a four phase diagnostic that measures LLM-driven traffic in analytics, identifies key prompts, benchmarks citation rates against competitors and produces improvement recommendations, explicitly covering ChatGPT, Gemini, Perplexity and AI Overviews.
You operate in finance, real estate, recruitment or ecommerce and want SEO and LLMO handled by one team that knows the regulatory constraints.
- LLMO diagnostic names the specific AI engines it measures, including Perplexity, which many Japanese competitors omit
- Twenty year operating history with dedicated verticals for regulated sectors such as finance
- Offers a free LLMO diagnostic as an entry point before any contract
- The free diagnostic is limited to five companies per month and requires the client to share analytics data
- No pricing or retainer minimum is published for SEO or LLMO consulting
LANY
LANY is a Tokyo digital marketing consultancy that positions itself as a growth partner and works across SEO, paid media, content and B2B marketing. Its service catalogue lists SEO consulting and LLMO consulting for AI search optimisation side by side, along with combined article production.
LANY runs a dedicated research arm publishing quantitative analysis, survey research and expert interviews on how Gemini, AI Overviews and GPT models change consumer search behaviour. Its company profile states the firm was established in October 2020.
You want a younger, research-active Japanese team that treats LLMO as a first-class service rather than an SEO add-on.
- Publishes original LLMO research including quantitative analysis and survey work
- Offers SEO consulting and LLMO consulting as separate, named service lines
- Case studies span B2B, finance, healthcare, legal, real estate and ecommerce clients
- Established in 2020, so it is younger and smaller than most of the other Japanese firms here
- No pricing, retainer minimum or headcount is published, and materials are Japanese only
How we ranked these agencies
- Depth of SEO experience, not general marketing
- Third-party review score on Clutch, GoodFirms or G2 where published
- Named services and a clear, public description of the offer
- Company longevity and team size
- Fit for enterprise versus small and mid-size brands
- Pricing transparency
- Evidence of real, named client work
Every agency listed is real and operating. Founding years, ratings and services come from the agency website or a third-party review platform, verified 2026-09-17. Where a figure is not published, the page says so rather than estimating.
Why work with a SEO agency in Japan
Japan uses LLMO, not GEO, as the standard term for AI search work. Every agency below sells it under that label, so expect LLMO in proposals even when the deliverables match what other markets call generative engine optimisation.
It is also the most tooling-heavy market in this directory. Three of the six build and sell their own AI visibility measurement products rather than reselling third-party trackers.
Pricing transparency is better than most of Europe. Two agencies publish monthly retainer floors openly, though both require a six month commitment.
Two agencies publish retainer floors, from 500,000 yen and roughly 600,000 yen per month, each on a six month minimum term. The rest are quote-only.
Frequently asked
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Before you hire anyone, see where you stand
Shoptank shows whether ChatGPT, Claude and Perplexity name your brand today, which sources they cite, and who gets recommended instead. Run it first, then brief the agency with real data.
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