Company
A message from our representative
Kenta Katagiri
After graduating from a faculty of pharmacy and working at a pharmaceutical company and pharmacies, Kenta Katagiri became independent. He now supports digital advertising and the design of customer acquisition and sales processes.
I want to see a future where growing a business can go hand in hand with protecting your time and health, and where owners, teams and customers can all thrive.
For me, this starts with building systems that create many kinds of value. Work should keep moving without one person having to carry it all, and each improvement should lay the groundwork for what comes next. These are the systems I want to build together with our customers.
We consider what is right for a business in terms of profit, time and health, as well as revenue. This thinking guides every part of our work at ISSEKI OKUCHO.
ISSEKI OKUCHO
Representative: Kenta Katagiri
Seminars & activities
GMO Shuminavi
Teaching as an official GMO Shuminavi ambassador
As an official GMO Shuminavi ambassador, Kenta Katagiri regularly teaches sessions on Meta advertising, local search optimization and practical uses of AI, sharing ideas and methods for attracting customers.
- Meta advertising
- Local search optimization
- Practical AI use
April 14, 2026
Practical AI × Instagram seminar for restaurants
Kenta Katagiri spoke at a practical seminar for restaurants on using AI and Instagram. The session explored customer acquisition through creating and testing reels, posts and ads on the spot.
Book
Meta Advertising That Leaves a Profit, Even When Outsourced
English rendering of the Japanese title. The book is available in Japanese.
Kenta Katagiri / Kindle edition (Japanese) / Published November 1, 2025 / 合同会社一石億鳥
A practical guide to structuring how you outsource Meta advertising while retaining profit. Written for business owners who feel that working with an agency has not led to higher sales, it introduces ways to start small with advertising from ¥500 a day and checkpoints for evaluating an outsourcing partner.
View on Amazon Japan ↗Our experience
From healthcare to customer acquisition
Our representative has a background in healthcare and has supported online customer acquisition for clinics, dental practices, pharmacies and other health-related businesses.
Professional involvement
- Advertising consultant at NELP
- Responsible for Kuchikomi 365 operations at Yello
Selected clients
- Bentley Motors Japan
- Animoca Brands株式会社
- 株式会社BLUE SKY TOKYO
- 株式会社ディライト
- 株式会社ビューディカル
- 株式会社dreamin
- 医療法人 愛和会
Community support
We have donated to organizations supporting single-parent households and provided support through businesses assisting care facilities.
Company profile
- Company name
- ISSEKI OKUCHO
合同会社一石億鳥 (Japanese limited liability company) - Representative
- Kenta Katagiri
- Corporate number
- 2010703006464
- Established
- November 11, 2022
- Address
- 141-0032, Japan
3-5-3 Osaki, Shinagawa-ku, Tokyo - Telephone
- +81 50-1725-0522
- Business areas
- Marketing
Consulting
System development, including chatbots - Banking partners
- Jonan Shinkin Bank
GMO Aozora Net Bank - Payment methods
- Credit cards (via Stripe)
Bank transfer - Terms of service
- Payment timing, returns, exchanges and other conditions are set out in the terms and contracts for each service.