AI-NATIVE PRODUCT STUDIO · TOKYO

TOKYO JST

Work worth signing.

A product studio in Tokyo. We help you decide what to build, then design it, build it and keep it running. AI makes us fast; people make it right. We only ship work we would sign our name to.

Get in touch → Selected work →

EST. 2026 · TOKYO · JAPAN

Trade name G Productions Japan LLC
Incorporated June 4, 2026
Corporate number 5011003024600
Head office Meguro, Tokyo

Work

Selected work

A brass printer's loupe standing on a fresh proof sheet with crop marks and a CMY color bar; cotton gloves at the edge

Featured work / IP technology

PatentOS

Client / IP Rich Inc. Field / IP technology Since / 2026

PatentOS is an AI-native platform for patent work. As its development partner, G Productions contributes product strategy, AI architecture, full-stack engineering, and brand design.

Scope / Product strategy / AI architecture / Full-stack engineering / Brand design

patentos.app ↗

Our role

  • Product strategy
  • AI architecture
  • Full-stack engineering
  • Brand design
The Nin-Ja Company home page before the renewal: company name, introduction and an icon menu over a background video
The renewed home page: a night bamboo forest and waterfall rendered in real time behind the headline Unseen craft. Unreal worlds.
Page load
Old site 6.7 s Renewal 0.34 s
Data on first load
Old site 1,709 KB Renewal 823 KB
Requests
Old site 129 Renewal 26
Languages
Old site English only Renewal English, Japanese

Home page, measured on 8 November 2026 from Tokyo: old site and renewal on the same machine and browser, cold cache, 1440 × 900. The renewal passes axe accessibility checks (WCAG AA) with zero violations.

Featured work / Website renewal

Nin-Ja Company

Client / Nin-Ja Company Co., Ltd. Field / Game art and real-time 3D Since / 2026

Nin-Ja Company is a Tokyo studio providing characters, environments and technical art for game titles in Japan and abroad. We led the full renewal of its corporate website, from research and design through engineering and launch. The brief: present the studio's credits and company details in a form buyers can verify, for publishers overseas and companies in Japan, and raise the quality of incoming enquiries.

Scope / Research and brand strategy / Web design / Real-time 3D / Bilingual copy / Full-stack engineering

nin-jacompany.com ↗ Read the case →

Our role

  • Research and brand strategy
  • Design and real-time 3D
  • Bilingual copy
  • Full-stack engineering
Gathrly Event tech An event platform for small paid gatherings in Japan and the United States (in development) ↗ here.dj Event tech A product for music, DJs, and events (in development) ↗ Prism Collective Music label A music label releasing work by human and AI artists ↗ GLOW & SEEK Games An online multiplayer game (in development) ↗

Services

From the first decision through operation

PLAN DESIGN BUILD OPERATE

  1. Product development

    We plan, design, build, launch, and operate web, mobile, and cloud products. Working prototypes make decisions concrete. We test early, release in focused increments, and improve from evidence.

  2. AI agent development and technical advisory

    We advise on technical direction, development teams, and practical AI adoption. When useful, we also design and implement AI agents, then evaluate and improve them in operation.

  3. IP technology and R&D

    We research and develop AI systems for patent and intellectual property work, including document analysis, valuation, and tools that support expert judgment.

  4. Studio businesses

    Gathrly and here.dj for event tech, the Prism Collective music label, and the game GLOW & SEEK. Three businesses of our own, whose lessons flow back into client work.

Other fields Our articles of incorporation also cover design, translation and localization, marketing and PR, events, media, publishing, and music. For each inquiry, we confirm the expertise and delivery scope we can provide.

Services in detail →

Technology

We build on proven, industry-standard technology.

Infrastructure
  • AWS
  • Google Cloud
  • Cloudflare
  • Vercel
AI agents
  • Claude Code
  • Codex
  • Cursor
Platform
  • GitHub
  • TanStack
  • Astro
  • Convex
  • PlanetScale
  • Turso

All marks are the property of their respective owners.

Film

How we work, in 30 seconds

Strategy, design and engineering in one team, finished to a standard we stand behind. A 30-second brand film about how we approach our work.

30 SEC / ENGLISH NARRATION / JAPANESE SUBTITLES

0:00 / 0:30

Philosophy

Japan's creativity, finished, signed, and shipped to the world

Generative AI made speed common. Our bet is what comes after speed: software built with enough care to be treated as work, not just delivered as output.

Right now we are focused on finding underused technology and intellectual property in Japan, turning it into products, and shipping those products into the world.

We finish. Working is not the same as finished. We finish to a standard we can stand behind.
Design is how it works. Design is more than appearance. It shapes behavior, language, and judgment.
Sign your work. Each of us makes the call and owns the outcome.
AI assists. People are accountable. AI handles research and prototyping. People set the direction and own the quality.

Read our philosophy →

AI agents

We design and deploy AI agents around your workflows

We identify the workflows that matter, design purpose-built AI agents for them, and introduce them alongside the people doing the work. We evaluate the results in practice and keep improving the system as the work evolves.

AI AGENTS RESEARCH, BUILD, AND CHECK PEOPLE DECIDE RESEARCH BUILD CHECK PEOPLE REVIEW EVALUATE AND IMPROVE
  • SALES 営業
  • MARKETING マーケティング
  • FINANCE 経理・財務
  • LEGAL & IP 法務・知財
  • HR & HIRING 人事・採用
  • SUPPORT カスタマーサポート
  • RESEARCH リサーチ
  • EDITORIAL 編集・執筆
  • DESIGN デザイン
  • ENGINEERING 開発
  • DATA データ分析
  • OPERATIONS 運用・監視
Services → Talk to us →

Team

A team of specialists, supported by AI

Projects are led by our representative member and delivered with contract specialists across six areas of expertise. Outside experts join when a project needs them. AI agents support repetitive work such as research, prototyping and testing, under the direction and review of the specialist responsible for each area. People set the direction, review what is delivered, and are accountable for the result.

Representative member 1
Contract specialists 6 on average
AI agents Used in all six areas
  1. Producer & Director, Founder 制作総指揮・代表社員 Günther Brunner / ブルンナー・グンタ Sets the direction and is accountable for quality and final approval.
  2. Project Management プロジェクトマネジメント Schedules, priorities, and the quality bar.
  3. Frontend Engineering フロントエンドエンジニアリング Web implementation, performance, accessibility.
  4. AI Research AIリサーチ Model evaluation, agent design, generation pipelines.
  5. Interface Design インターフェイスデザイン UI/UX, information architecture, prototyping.
  6. Operations & Infrastructure 運用・インフラ APIs, data, and cloud operations.
  7. Design Direction デザインディレクション Brand, art direction, and overall visual quality.
More about the team → See open roles →

Representative

Founder

Portrait of Günther Brunner, Representative Member

Representative Member / Design Engineer

Günther Brunner

ブルンナー・グンタ

Our purpose
Japan's creativity, finished, signed, and shipped to the world.

Günther is a design engineer who came to Japan in 2007 as a MEXT government scholar. He then spent 15 years building products at CyberAgent, Inc., a Tokyo Stock Exchange Prime-listed internet company. His open-source project OpenSTF has more than 14,000 GitHub stars and is used by more than 200 organizations worldwide, including Netflix and Alibaba. His experience includes public-sector systems for Japan's National Tax Agency, JICA, and the Ministry of Internal Affairs and Communications, as well as AI product development. He is a permanent resident of Japan and works in Japanese (JLPT N1), English, and Spanish.

guntherbrunner.com GitHub / @gunta X / @gunta85

Read our philosophy →

Came to Japan as a MEXT scholar
2007
Building products at CyberAgent
15yrs
GitHub stars on OpenSTF
14,000+
Organizations using OpenSTF
200+

News

Announcements

All news →

Company

Corporate profile

Company name G Productions Japan合同会社
English name G Productions Japan LLC
Incorporated June 4, 2026
Capital JPY 300,000
Representative Günther Brunner (ブルンナー・グンタ), Representative Member
Team 1 representative member and 6 contract specialists on average
Head office 4-4-12 Aobadai, Meguro-ku, Tokyo 153-0042, Japan
Phone 03-6822-6520 Hours: Weekdays 10:00–18:00 JST
Corporate number 5011003024600 Verifiable on the National Tax Agency corporate number site
Invoice reg. no. T5011003024600 Qualified invoice issuer, verifiable on the National Tax Agency invoice registry
Fiscal year June 1 – May 31
Business
  • Software, IT systems, and cloud services (SaaS): planning, development, operation, and maintenance
  • Artificial intelligence (AI): research and development, implementation, adoption support, and consulting
  • Technical advisory, support for building engineering teams, and digital transformation (DX)
  • UI/UX, product, and brand design
  • Websites, mobile applications, and games: planning, development, and operation
  • Translation, interpreting, localization, and multilingual content production
  • Marketing, branding, public relations, market research, and management consulting
  • Events, conferences, and music festivals: planning, production, and operation, including sound, lighting, and spatial design
  • Video, audio, photography, publishing, and social media: planning, production, distribution, and rights management
  • Books, e-books, and manga publishing; music production, distribution, and copyright management
  • Software and cloud services supporting company formation and registration filings
The above is a selection of the 22 business objectives set out in Article 2 of our articles of incorporation.
Principal clients IP Rich Inc., Nin-Ja Company Co., Ltd.

Message and history →

Careers

We are hiring makers

We are looking for people who want to decide what gets built and see it through long after launch: people who use AI as a tool and own the quality of what ships.

  • Remote Work fully remote from anywhere in Japan.
  • In-person collaboration Scheduled in-person meetings can be held at THE N3 in Aobadai, Meguro.
  • Flexible arrangements We agree on the balance of remote and in-person collaboration for each role and project.

See open roles →