Business UtilizationJuly 8, 2026
How to Negotiate AI Tool Contracts to Your Advantage
Practical tips to help small business owners negotiate AI tool contracts without leaving money on the table.
Read more →We put AIto work for your company.
We build what we genuinely need for ourselves. Use it, prove it, then bring it to yours.
See our work↓Scroll
About
Not an experiment. Proof.
The blog on this site is written by AI. Sales, strategy, operations — all AI-driven. nanakazoku is its own proof of concept.
That's why we can say it: AI works for your business too. We'll build the same system for you.
Mission
From 'using AI' to 'running on AI.'
Vision
Build the world where AI runs companies — starting now.
Services
Tools we built for ourselves. Now yours.
We needed it, so we built it. We still use it — that's why it works.
AI Product Development
Build SaaS tools, business apps, and browser extensions at speed — with Claude Code as co-engineer. We've shipped 9+ products ourselves; we build yours the same way.
Business System Development
Analytics, task management, information aggregation — we build custom systems for real workflow problems. We deploy the same tools we run in our own operations.
AI Integration Support
From AI-powered website builds to automated content and inquiry handling — we help you find where to start, then build systems that actually run.
Works
Work.
Built because we needed it. It works because we still use it.
Browser Tool / Figma Plugin2026-07-05
NANA CONVERTER
Import any webpage into Figma in an instant — a Chrome Extension + Figma Plugin combo. One click captures the DOM, converts it to a structured DesignTree JSON, and copies it to clipboard. Paste into the Figma plugin to recreate text, layout, colors, and images as native nodes. Our eighth shipped product, co-developed with Claude Code.
Browser Tool2026-07-02
.xd Viewer
An unofficial viewer for Adobe XD files (.xd) that runs entirely in the browser. Drag and drop a .xd file to inspect its design contents — no upload, no server, fully privacy-friendly. Our seventh shipped product, co-developed with Claude Code.
Client Work / AI Operations2026-06-30
Morris Company
A specialist in business system direction and UI design for web applications. We support Morris Company with Claude Code — aggregating the latest info across their sites and compiling service update history. Our first external client putting 'running on AI' into real practice.
Analytics SaaS2026-06-26
NANA COUNTER
NANA COUNTER — an in-house web analytics tool. Drop in one line of script to get real-time page views, referrers, and top pages. Cookie-free, privacy-friendly, supports multiple sites from a single dashboard. Our sixth shipped product, co-developed with Claude Code.
Task Management App2026-06-22
NANA BOARD
NANA-BOARD — an in-house task management tool built with Next.js and Google Tasks API integration. Co-developed with Claude Code. Our fifth shipped product, proving we build and use the tools we recommend.
Development Dashboard2026-05-30
NANAKAZOKU Lab
A progress dashboard for the '100 Web Samples with Claude Code' project. Tracks each sample in real time — Not Started, In Progress, or Done — giving a live view of the full build.
Technical Documentation Site2026-05-30
Claude Design Japanese Guide
A comprehensive Japanese guide to mastering Claude Design. 40 pages of content co-created with AI, built with Astro. The second in our documentation series — following claudecode, we teach the design tool we use ourselves.
Technical Documentation Site2026-05-24
Claude Code Japanese Guide
A comprehensive Japanese guide to mastering Claude Code. 83 pages of content co-created with AI, built with Astro and Starlight. We don't just talk about using AI — we built a site that teaches the exact tool we used to build it.
AI-Driven Website2026-05-18
Nanakazoku
Our own site is our first case study. A bilingual Next.js website, a blog written by AI every morning, a contact form that generates a full proposal draft in under 30 seconds — all built with AI as co-engineer. This site is still running.
Team
Leadership.
F
fumiharu
Chairman / Co-founder
“I want to make the world a little better with AI.”
B
bunzaburo
CEO / Co-founder
“My job is to create things people don't yet know they need.”
Insights
Latest articles.
Business Use CasesJuly 7, 2026
How to Unify Your Brand Voice with AI
Is your website, social media, and email tone inconsistent? Learn how to use AI to unify your brand voice across all channels.
Read more →Business UtilizationJuly 6, 2026
How to Prevent Customer Churn with AI
AI can warn you before customers leave. Practical customer retention strategies for small businesses.
Read more →Changelog
Updates.
This site is our own experiment. Always evolving.
2026-07-05
Launch
NANA CONVERTER launched
h2f.nanakazoku.com is live. A Chrome Extension + Figma Plugin that imports any webpage into Figma in one click — DOM analysis, DesignTree conversion, native node output. Our eighth shipped product, co-developed with Claude Code.
2026-07-02
Launch
.xd Viewer launched
xd.nanakazoku.com is live. An unofficial Adobe XD file viewer — drag and drop a .xd file to inspect its contents entirely in the browser, no server upload. Our seventh shipped product, co-developed with Claude Code.
2026-06-30
New Client
Morris Company — first external client added to Works
Morris Company (morriscompany.ltd), a specialist in business system direction and UI design, is now in our Works section. We're supporting them with Claude Code for multi-site info aggregation and service changelog management.
2026-06-26
Launch
NANA COUNTER launched
analytics.nanakazoku.com is live. An in-house web analytics tool — one line of script, real-time page views, cookie-free and privacy-friendly, multi-site support. Our sixth shipped product, co-developed with Claude Code.
2026-06-22
Launch
NANA-BOARD launched
task.nanakazoku.com is live. An in-house task management tool integrated with Google Tasks API, built with Next.js and co-developed with Claude Code. Our fifth shipped product.
2026-05-30
New
2 new Works added
claudedesign.nanakazoku.com (Japanese guide to Claude Design) and mock.nanakazoku.com (100 web samples progress dashboard) added to the Works section.
2026-05-24
New
Works section launched
Added a portfolio section. nanakazoku.com itself is listed as Case Study #1. Automated screenshot capture system also built.
2026-05-24
New
Pricing page published
New Pricing section added. Full transparency on AI agent development, business system development, and maintenance plans.
2026-05-23
Improved
Full site copy rewrite
New hero: 'This company runs on AI.' About, Services, Mission, and Vision all rewritten from scratch.
2026-05-23
New
Auto-blog system
GitHub Actions workflow: Claude API generates and publishes a new blog post every morning at 7AM JST.
2026-05-22
Improved
Blog migrated to Markdown
Blog posts moved from hardcoded TypeScript to Markdown files. Easier to add and edit content.
2026-05-20
New
AI proposal generation
Contact form now triggers Claude API to auto-generate a proposal draft within 30 seconds, emailed directly to the owner.
2026-05-20
New
Bilingual support (JA/EN)
Full site available in Japanese and English. Blog posts also available in both languages.
2026-05-18
Launch
Site launched
nanakazoku.com goes live. Next.js site auto-deployed to heteml via GitHub Actions.
Contact
Let's talk.
If you have the same challenges, we have the same solutions. Let's figure it out together.