Principle is a bilingual digital marketing agency, helping English-speaking clients in Japan since 2011.

Promote your brand in Japan, all in English.

Principle is a bilingual digital marketing agency, helping English-speaking clients in Japan since 2011.

Take your brand into Japan with confidence.

Localized success, without any compromises.

Get in touch?

Looking for your next partner?

Full-stack Marketing Support

Getting starting in Japan as a business from abroad is difficult. How do you set up local digital adveritising platforms, and which platforms are the best? What landing page design do I need to achieve a higher conversion rate? What does Japanese content marketing look like?

Principle offers fully modular packages designed to tackle these challenges head-on. From ads management and SEO auditing to Google Analytics implementation and tag refinement, you have the full support of our company supporting your team.

Campaign Management

Local Platforms, World-Class Performance

In addition to being an agency partner with Google and Meta, we are also recognized by all of Japan's major digital advertising channels. From account creation to unparalleled campaign management, let us help you with LINE, Yahoo! Japan, Rakuten and more.

  • Dedicated to Testing

    Digital marketing campaigns are more than just a budget. We will always test new campaigns, audiences, keywords, and more to ensure consistently improving performance.

  • Data-driven Strategies

    Principle is first and foremost an Analytics agency. All ad campaigns come with dashboard integration via Looker Studio, allowing you to see in real-time your performance metrics, and how we use your data to inform our next decisions.

  • Uniquely Bilingual

    Our bilingual consultants know what resonates with Japanese users, from ad copy to branding. We use a combination of local channels together with global platforms to reach and connect with the widest and most effective range of native users.

  • No Artificial Barriers

    There should never be any barriers when accessing your own data. You will always have full access to all the ad platforms we operate on your behalf, with full visibility on all KPIs and budgets.

Search Engine Optimization

SEO Built to Beat the Algorithm

Organic search is changing. From increased paid shopping ad placements to robust AI summaries placed at the top of popular search queries, companies now have to compete for the ever-decreasing amount of organic search listings.
Our knowledge of how organic search works on the backend, as well as best practices for Japanese sites, will give your brand the edge it needs.

  • Technical SEO

    Make sure search engines in Japan are properly ranking your site. Ensure bilingual coverage of your domain and webpages with our technical SEO support. We work with you to identify errors in crawling your website backend, and in particular help you identify issues keeping your website from ranking on Japanese SERPs.

  • Total Search Coverage

    Eliminate reducancies in your paid search campaigns by identifying keywords with strong organic coverage. Improve budget allocations in your marketing mix by creating a measureable and reliable backend.

  • Content Marketing Support

    Let us help you understand how Japanese websites use content marketing to rank on the search engine result page while also engaging high-quality audiences. From analyzing bottlenecks in existing content to recommending action items, we can help you make immediate changes to your website and start driving results.

  • Bilingual Reporting

    No local team in Japan? No problem. Our SEO team can compile all reports and advice in English for your company, and provided Japanese-language recommendations for page titles, metadata, and much more.

Data Analytics

Japan's Leading Analytics Agency

Our Analytics consultants are pioneers in Japan's market. We were among the first companies to support Tableau and Google Analytics 4 in Japan, and host weekly seminars with Japan's top analytics agencies and vendors. From data migration and dashboard construction to strategy consulting and execution, we've got you covered.

  • Google Analytics icon
    Google Analytics 4

    Many marketing professionals are still stuck using GA4 like Universal Analytics, looking only at source/medium reports. Our analytics team adopted GA4 far before the mandatory deadline. Let us unlock the full potential of your GA4 property with custom metrics, search reports, audience integration, custom dashboards and more.

  • Tableau icon
    Tableau

    As one of the first Japanese agencies that published books on Tableau in Japanese, we have a proven track record of helping clients turn their data into robust dashboards. We can support you from data warehousing through to visualization, and can offer custom metrics, user insights, online-to-offline measurement and more.

  • Custom Metrics and Dashboards

    Empower your business insight with valuable metrics presented in curated dashboards on Tableau and Looker Studio. See lifetime value, purchase cohort, product quintile growth and more, and learn how to turn these metrics into actionable insights.

Localization Support

Original Copy Localized Variation Click-through-rate Cost-per-click
Eng. A Jp. A-1 1.14% ¥19
Eng. A Jp. A-2 1.31% ¥21
Eng. A Jp. A-3 1.94% ¥34
Eng. B Jp. B-1 0.98% ¥13
Eng. B Jp. B-2 1.41% ¥15

Native Support, Without Compromises

Starting from zero in an unfamiliar market is challenging, especially without a local to give you honest advice. Our consultants can work with you to plan creatives and LPs for your marketing campaigns in Japan, using best practices that ensure you're messaging what Japanese users are searching for.

  • Creative Support

    Let us help you craft banner and video creatives that work in Japan. We know where users look and what they're looking for, and can provide expert-crafted Japanese copy and edit your images and videos with new text. We will work alongside you to conform to marketing guidelines and create creatives that both your and your future customers will love.

  • Landing Page Optimization

    Japanese users value different things when looking at a web page. Companies and brands see higher conversion rates with a landing page that's localized with not only native language, but also layout. We can help you find the bottlenecks on your website via A/B testing, heatmaps, user testing and more.

From BtoC to BtoB, we've got you covered.

From international Ecommerce powerhouses to businesses just getting starting marketing abroad, we've worked with a wide variety of partners across all industries. Here are just a few.

"When we gave Principle our marketing objectives, they provided constant proposals and strategies to ensure that our goals were met. More than that, they gave us advice on how to improve areas of our marketing measurement outside of their control in order to improve the total quality of our strategy. We highly recommend them."

"Principle's responses are always timely, and they are proactive in reaching out to us with new information and platform updates. We're grateful for all the help they provide our team."
"We don't have anybody in-house with the depth of GA4 analytical skills that Principle offers. Having our projects run by the pros has been invaluable to our business."
"Beyond managing our digital marketing campaigns, Principle always gives us several proposals for how to improve and achieve our KPIs - even going beyond the scope of the project in doing so."
"We are more than satisfied with Principle's team structure, the mindsets of their managers and engineers, and the skill levels of of everyone involved on the project."

Our Work

Here is a look at some case studies from just a few of the clients we've worked together with.

  • Full-funnel Advertising for Global Fashion Brand

  • How Principle helped :
    • ・Revamped campaigns by audience and funnel objective.
    • ・Created a wide range of lookalike audiences based on CRM audience exports.
    • ・Selectively targeted users in above audience based on product category affinity.
+32.9%
revenue increase YoY,
with 11.2% increased budget

  • Analytics Consulting for Sports Apparel Brand

  • How Principle helped :
    • ・Data feed consulting: re-designed data feed structure and system.
      (e.g. repurpose item ids, include inventory data, added availability type, etc.)
    • ・Enhanced event types and parameters.
      (e.g. track item_group_id in item list page while purchase pages have SKU id)
+85.7%
ROAS increase YoY

Blogs

Need a quick-start on marketing in Japan? Check out what some of our consultants have written.

Preview img for blog

Japanese Digital Marketing – A Primer

2025/03/25

Corporate Information

Company Name Principle Co., Ltd (株式会社プリンシプル)
Date of Incorporation October 12, 2011
Address 〒 101-0062
Try-Edge Ochanomizu 10F, Kanda Surugadai 4-2-5 Chiyoda Ward, Tokyo
CEO Kenichiro Kusuyama
Email info@principle-c.com
Phone Number +81 03-6206-9003
Local Branches Eboost Consulting (Principle America Corp.)
Principle Philippines (PPH)