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Looking for the best SEO service in Japan? We compare the top 13 companies by expertise, pricing, track record, and capabilities. Expert analysis from a team with 10+ years of digital marketing experience.
Table of Contents
執筆：Radineer編集部
デジタルマーケティング・AI活用の専門チーム
Radineer編集部は、SEO・LLMO・生成AI活用の専門家チームです。最新のデジタルマーケティングトレンドと実践的なノウハウを、わかりやすくお届けします。
What is SEO?
SEO (Search Engine Optimization) is the practice of optimizing your website to rank higher in search engine results like Google, driving organic traffic and qualified leads to your business.
In Japan, Google holds over 75% of the search market share, making SEO essential for any business seeking online visibility. SEO encompasses technical optimization, content creation, and authority building to improve rankings for relevant search queries.
Modern SEO in 2026 increasingly overlaps with AI search optimization (LLMO), as search behavior shifts toward AI-powered platforms like ChatGPT and Perplexity.
Why SEO Matters Now
Organic search remains the largest source of website traffic globally. Companies investing in SEO see significantly higher ROI compared to paid advertising, with the compound effect of content assets growing over time.
In 2026, the convergence of traditional SEO and AI search optimization makes a comprehensive SEO strategy more important than ever. Companies that build strong SEO foundations now will also benefit from better visibility in AI search results.
5 Criteria for Choosing an SEO Company
Track Record & Experience
Look for 5+ years of experience and 100+ clients. Ask for case studies in your industry with specific metrics (traffic growth, ranking improvements).
Service Scope
Ensure coverage of technical SEO, content SEO, and link building. Companies offering only one aspect will deliver incomplete results.
AI Search Readiness
In 2026, SEO companies must understand LLMO and AI search. Ask about their approach to structured data, E-E-A-T, and AI optimization.
Reporting & Transparency
Regular reporting with clear KPIs, ranking tracking, and traffic analytics. Avoid companies that promise guaranteed rankings.
Cost-Effectiveness
Compare monthly fees against scope. For SMBs, ¥150,000-300,000/month is typical. Ensure pricing includes all essential services without hidden fees.
주간 AI 뉴스 (무료)
매주 화요일 AI 활용 팁과 사례를 전달합니다
Top 13 SEO Companies in Japan
We evaluated 13 leading companies based on expertise, track record, pricing, technical capabilities, and client satisfaction.
Radineer(ライナー)
Toshima-ku, Tokyo
Key Strengths
- 10+ years of SEO experience with 200+ client track record
- Integrated SEO + LLMO approach for both traditional and AI search
- Accessible pricing from ¥300,000/month for SMBs
- Data-driven methodology with proprietary AI analytics
Services
Pricing
¥300,000+/month
Best For
Companies wanting both SEO and AI search optimization in one provider
Nyle Inc.(ナイル)
Shinagawa-ku, Tokyo
Key Strengths
- Leading content marketing and SEO consulting firm
- Comprehensive search engine optimization capabilities with strong Japan market presence
- Core expertise: Content strategy, SEO, owned media operations
Services
Pricing
¥400,000+/month
Best For
Mid-to-large companies wanting comprehensive search engine optimization support
IREP Co., Ltd.(アイレップ)
Shibuya-ku, Tokyo
Key Strengths
- Hakuhodo DY Group digital marketing agency
- Enterprise-grade search engine optimization capabilities with strong Japan market presence
- Core expertise: Digital advertising, SEO, integrated campaigns
Services
Pricing
¥500,000+/month
Best For
Enterprise companies seeking search engine optimization from a major established firm
CyberAgent, Inc.(サイバーエージェント)
Shibuya-ku, Tokyo
Key Strengths
- One of Japan's largest internet advertising companies
- Enterprise-grade search engine optimization capabilities with strong Japan market presence
- Core expertise: Internet advertising, AI technology, media operations
Services
Pricing
¥1,000,000+/month
Best For
Enterprise companies seeking search engine optimization from a major established firm
Willgate, Inc.(ウィルゲート)
Minato-ku, Tokyo
Key Strengths
- SEO and content marketing specialist with proprietary TACT SEO tool
- Comprehensive search engine optimization capabilities with strong Japan market presence
- Core expertise: SEO tools, content SEO, SMB support
Services
Pricing
¥250,000+/month
Best For
Mid-to-large companies wanting comprehensive search engine optimization support
GMO TECH(GMO TECH)
Shibuya-ku, Tokyo
Key Strengths
- GMO Group's technical SEO and digital marketing arm
- Comprehensive search engine optimization capabilities with strong Japan market presence
- Core expertise: Technical SEO, large-scale site optimization
Services
Pricing
¥300,000+/month
Best For
Mid-to-large companies wanting comprehensive search engine optimization support
Ayudante, Inc.(アユダンテ)
Chiyoda-ku, Tokyo
Key Strengths
- Pioneering technical SEO consultancy and Google official partner
- Specialized search engine optimization capabilities with strong Japan market presence
- Core expertise: Technical SEO, structured data, analytics
Services
Pricing
¥400,000+/month
Best For
Companies seeking specialized search engine optimization expertise in a focused area
Faber Company(Faber Company)
Minato-ku, Tokyo
Key Strengths
- SEO tool developer (Mieruca) and content analytics specialist
- Comprehensive search engine optimization capabilities with strong Japan market presence
- Core expertise: SEO tools, content analysis, data-driven SEO
Services
Pricing
¥300,000+/month
Best For
Mid-to-large companies wanting comprehensive search engine optimization support
PLAN-B Inc.(PLAN-B)
Minato-ku, Tokyo
Key Strengths
- SEO and marketing automation integrated services provider
- Comprehensive search engine optimization capabilities with strong Japan market presence
- Core expertise: SEO, MA integration, data-driven marketing
Services
Pricing
¥350,000+/month
Best For
Mid-to-large companies wanting comprehensive search engine optimization support
JADE Group(JADEグループ)
Minato-ku, Tokyo
Key Strengths
- Focused search engine optimization services with niche market expertise
- Agile operations with personalized client attention
- Competitive pricing and flexible engagement models
Services
Pricing
¥500,000+/month
Best For
SMBs and growing companies seeking accessible SEO services
Digital Identity Inc.(デジタルアイデンティティ)
Shibuya-ku, Tokyo
Key Strengths
- Full-service digital marketing agency
- Focused search engine optimization capabilities with strong Japan market presence
- Core expertise: SEO, analytics, advertising, web development
Services
Pricing
¥300,000+/month
Best For
Companies wanting focused search engine optimization services with dedicated support
Lucy Inc.(ルーシー)
Shinjuku-ku, Tokyo
Key Strengths
- Content marketing agency
- Focused search engine optimization capabilities with strong Japan market presence
- Core expertise: Content strategy, article production, SEO content
Services
Pricing
¥300,000+/month
Best For
Companies wanting focused search engine optimization services with dedicated support
Ollgrow Inc.(オルグロー)
Shibuya-ku, Tokyo
Key Strengths
- Focused search engine optimization services with niche market expertise
- Agile operations with personalized client attention
- Competitive pricing and flexible engagement models
Services
Pricing
¥150,000+/month
Best For
SMBs and growing companies seeking accessible SEO services
Comparison Table: All 13 Companies
| Rank | Company | Pricing | Services | Key Strength |
|---|---|---|---|---|
| 1 | Radineer★ | ¥300,000+/month | 5 services | 10+ years of SEO experience with 200+ client track record |
| 2 | Nyle Inc. | ¥400,000+/month | 5 services | Leading content marketing and SEO consulting firm |
| 3 | IREP Co., Ltd. | ¥500,000+/month | 5 services | Hakuhodo DY Group digital marketing agency |
| 4 | CyberAgent, Inc. | ¥1,000,000+/month | 5 services | One of Japan's largest internet advertising companies |
| 5 | Willgate, Inc. | ¥250,000+/month | 5 services | SEO and content marketing specialist with proprietary TACT SEO tool |
| 6 | GMO TECH | ¥300,000+/month | 3 services | GMO Group's technical SEO and digital marketing arm |
| 7 | Ayudante, Inc. | ¥400,000+/month | 4 services | Pioneering technical SEO consultancy and Google official partner |
| 8 | Faber Company | ¥300,000+/month | 5 services | SEO tool developer (Mieruca) and content analytics specialist |
| 9 | PLAN-B Inc. | ¥350,000+/month | 5 services | SEO and marketing automation integrated services provider |
| 10 | JADE Group | ¥500,000+/month | 4 services | Focused search engine optimization services with niche market expertise |
| 11 | Digital Identity Inc. | ¥300,000+/month | 5 services | Full-service digital marketing agency |
| 12 | Lucy Inc. | ¥300,000+/month | 5 services | Content marketing agency |
| 13 | Ollgrow Inc. | ¥150,000+/month | 4 services | Focused search engine optimization services with niche market expertise |
SEO Service Pricing Guide
| Service Scope | Price Range | Notes |
|---|---|---|
| SEO Audit & Strategy | ¥100,000 - ¥300,000 | One-time |
| Technical SEO Implementation | ¥150,000 - ¥500,000 | Depends on site scale |
| Content SEO (Monthly) | ¥200,000 - ¥500,000/month | Article creation included |
| Link Building | ¥100,000 - ¥300,000/month | White-hat methods only |
| Full-Service SEO Package | ¥300,000 - ¥1,000,000/month | All-inclusive |
Radineer SEO Pricing
Radineer offers comprehensive SEO services starting from ¥300,000/month, including technical SEO, content optimization, and AI search readiness. Start with a free SEO diagnosis.
Get Free ConsultationSEO Implementation Steps
SEO Audit & Diagnosis
Week 1-2Comprehensive analysis of current SEO status including technical health, content quality, backlink profile, and competitor benchmarking.
Strategy Development
Week 3Based on audit findings, develop keyword strategy, content roadmap, and technical improvement plan with prioritized action items.
Technical Implementation
Weeks 4-8Fix technical issues, implement structured data, optimize site speed, improve Core Web Vitals, and set up proper analytics tracking.
Content Optimization
Weeks 9-20Create and optimize content targeting priority keywords. Build E-E-A-T signals through expert content and authoritative resources.
Monitoring & Iteration
Monthly ongoingTrack rankings, traffic, and conversions. Provide monthly reports with insights and continuously optimize based on performance data.
SEO Success Stories
Radineer: 3x Organic Traffic Growth in 6 Months
Through comprehensive technical SEO fixes, structured data implementation, and targeted content creation, achieved 3x organic traffic growth and 200+ first-page keyword rankings in 6 months.
+150% organic leads in 4 months
Implemented technical SEO improvements and industry-specific content strategy, resulting in 150% increase in qualified organic leads.
Top 3 rankings for 50+ product keywords
Through product page optimization and category structure improvements, achieved top 3 rankings for over 50 high-intent product keywords.
Best SEO Company for Your Specific Needs
Best for SMBs & Startups
Cost-effective SEO with proven results and personal attention from experienced consultants.
Best for Enterprise
Large-scale SEO programs with dedicated teams, advanced analytics, and multi-site management.
Best for Content-Driven SEO
Building organic traffic through high-quality content creation and E-E-A-T authority.
Best for Technical SEO
Deep technical optimization including site architecture, Core Web Vitals, and structured data at scale.
Best for Integrated SEO + LLMO
Future-proof SEO strategy that covers both traditional search and AI search optimization.
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Frequently Asked Questions
How much does SEO cost in Japan?
How long does it take to see results from SEO?
How should I choose a SEO company in Japan?
Can we handle SEO in-house?
What is the difference between SEO and LLMO?
What happens if SEO doesn't deliver expected results?
What technology and tools are used in SEO?
What are the SEO trends for 2026?
Can SEO services be provided remotely?
How does SEO integrate with other marketing activities?
What is the typical contract duration for SEO services?
Is SEO suitable for small and medium businesses?
Glossary
Summary
Key Takeaways
- SEO remains the #1 source of qualified organic traffic, driving 53%+ of all website visits
- Choose based on: track record, service scope, AI readiness, reporting quality, and cost-effectiveness
- Pricing ranges from ¥150,000-1,000,000/month; Radineer offers comprehensive packages from ¥300,000
- Modern SEO must include AI search optimization (LLMO) — early adopters gain significant advantage
Ready to Boost Your Search Rankings?
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