We put AIto work for your company.

We build what we genuinely need for ourselves. Use it, prove it, then bring it to yours.

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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.

Windows Desktop App / File Organizer2026-08-02

NANA FOLDER

A Windows desktop app for organizing files by date — fast. Drop files onto a tile and they move to a dated folder automatically. Manage shortcuts to folders, files, and apps as tiles for one-click launch. Three tile types — Move, Link, App — freely arranged to match your workflow. Our ninth shipped product, co-developed with Claude Code.

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.

fumiharu

Chairman / Co-founder

“I want to make the world a little better with AI.”

bunzaburo

CEO / Co-founder

“My job is to create things people don't yet know they need.”

Insights

Latest articles.

View all articles →

Business UtilizationSeptember 24, 2026

How to Systematize Repeat Business with AI

Learn how to build a system that brings customers back naturally, using AI in practical, step-by-step ways.

Business Use CasesSeptember 23, 2026

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.