AI
AI that gives back people and hours
- Drafting replies to inquiries
- Reading documents into your systems
- Setting up how your team uses AI
Business Support Studio — AI, Apps & Beyond
Tying in
what’s missing.
AI, apps, the web — and the systems behind your work. A studio that builds for any industry, any size, anywhere.
There’s no fixed menu. Tell us what’s in the way, and we tie it up in whatever form fits best — AI, an app, or both. Confidential work is built to your rules. And where a market is still waiting, we launch apps of our own.
Not sure it’s even possible? That’s exactly where to start.
- Scope
- Planning to launch — and beyond
- Range
- AI, apps, web, automation — and more
- Languages
- 日本語 · English · 한국어
- For
- Individuals, sole proprietors and companies
Our view
It isn’t the technology that’s missing.
It just hasn’t been tied in yet.
Most workplaces already have both: technology that could help, and problems worth solving. What’s missing is the knot — tying the two together in a way that fits how the work is really done.
MUSUBI builds that knot with AI, apps and the web — not through a sweeping rollout, but by making one daily chore disappear first.
Start small, then prove it
We don’t build big on day one. We build the part that shows results, test it in real use, then expand.
Fit the tool to the work
Instead of bending your work to a tool, we shape the tool around how you already work.
Decide what to protect first
Confidential data, personal information, access rights — we set the boundaries first, then choose how to build.
Sound familiar?
Not enough people or hours —
and the work never shrinks.
Whatever the industry, sole proprietor or company, what’s missing tends to look much the same.
- Repetitive daily tasks are eating up your people and hours.
- AI looks like it could help, but you’re not sure how to build it into your work.
- Nothing off the shelf quite fits the way you work.
- Confidential information means you can’t simply hand the work to an outside service.
- Before hiring more, you’d like to see what a system could take on instead.
- Having someone build it feels too costly and slow to even start.
Services
No fixed menu.
We tie in whatever you need.
Any industry, any size, anywhere. These are just some of the threads we work with — one at a time, or several woven together.
Business apps
Built around the way you work
- Paper and spreadsheets, turned into an app
- Bookings, customers and sales in one place
Mobile apps
Apps for iPhone and Android
- From the first sketch to store review
- Running and improving it after launch
Websites
Websites that get the message across
- Sites for companies, shops and services
- Multilingual sites and search visibility
Not on the list?
Ask us anyway.
Automation & data
Connect, automate, make it visible
- Getting your tools to talk to each other
- Automated reports and dashboards
Languages & borders
Work that crosses languages and borders
- Guides in Japanese, Korean and English
- Systems for customers and staff from abroad
New ventures
Turning an idea into something real
- Build small, test it with real people
- All the way to launch and beyond
Security
Confidential work, built to your rules
- Running inside your own environment
- Minimal data out — and an NDA first
Our own product
We build —
and ship — our own, too.
USTY (어스티), an app for Japanese–Korean couples. Planning, design, development, servers, app-store review and day-to-day running — all handled in-house by MUSUBI. Now in testing — testers welcome.
- iPhone, Android and iPad
- Japanese and Korean, side by side
- Messages encrypted on the device
- Official disaster alerts and safety check-ins
- AI translation and an in-app assistant
- Shaped week by week with testers
Your app gets the same craft — and the same care.
Visit the USTY site
For individuals
Wish there were an app for that?
Tell us.
Something missing from everyday life might be just one app away. When we build an app from an individual’s idea, there’s no charge for making it.
Who can send one?
Individuals. Send us the app you’ve wished for in everyday life — not for a company or a shop. Companies, organisations and sole proprietors are welcome as regular inquiries (priced through conversation).
What to tell us
When it gets in the way, who would use it, how you manage today, and what would make you happy. The button below opens the idea form (email works too). No need to include your address, health details or other personal information.
What happens next
We read every idea. Starting with the ones that would help the most people and that we can build well, we make them as MUSUBI apps — and launch and run them ourselves. If we take yours on, we’ll email you, and we may ask you to try it before launch. We can’t turn every idea into an app.
Process
How we work
It starts with whether it’s possible — including whether to build something new, or combine AI with the tools you already have.
- 1
Get in touch
Tell us what you’re dealing with — through the form, by email or by phone — even if you’re not sure it can be done.
- 2
Proposal & quote
An AI system, an app, or a mix — we propose the simplest path that works, and nothing more.
- 3
Build small, verify
We build the part that shows results first and test it in real use — checking it against your security rules as we go.
- 4
Launch, and after
Once it’s live, we keep tuning and improving as needed.
Security & confidentiality
What we agree on
before we touch your data.
When a project involves confidential information, we settle these points together before any building starts.
An NDA, first
We can sign a non-disclosure agreement before you share any details.
Decide what leaves
We agree which data, if any, goes to outside services — and keep it to the minimum.
Inside your environment
Where needed, it runs inside your own environment.
Choosing AI services
We choose AI services and settings that don’t use your inputs for training.
Access, and afterwards
Access is limited to those who need it, and materials are returned or deleted when the work ends.
Every company’s rules are different. We check each point against yours.
Pricing
Pricing
Priced through conversation
Every project needs something different, so there’s no flat rate. We quote after hearing what you need and how big it is.
Start small, then grow
We can start small — build a little, try it, and expand once it proves its worth.
Whether we’re a fit is a conversation, too
We can’t meet every request. Let’s work out together, through conversation, whether we can.
App ideas from individuals (not companies, organisations or sole proprietors) are free to make. App ideas
From the founder
A note from the founder
Every workplace has something missing — not enough people, not enough hours, no tool that quite fits. More often than not, the technology to fix it already exists. It just hasn’t been tied in.
MUSUBI is a studio that ties that knot — with AI, apps and the web, for any industry, any size, anywhere. Whether it’s a system for a company or an app for everyday people, the approach is the same: start from someone’s real problem, build small, put it in their hands, listen, and improve. Our own app, USTY, is growing through exactly that loop right now.
If you’re not sure something is even possible, that’s the best time to reach out. Let’s find the knot together.
Masaki Kushida, Founder
Global
For International Founders in Japan
For those with roots overseas, doing business here in Japan. If language or unfamiliar customs make it hard to reach out, we’re here. Consultations in your native language are always welcome — for non-Japanese inquiries, please start with an email.
“Connecting what’s missing to what’s possible — no matter where you started.”
Contact
Let’s start with
“is this even possible?”
AI, apps, the web — or something not on our list. Reach us through the form, by email or by phone.
Common starting points
“Could AI take this task off our hands?”“We want to turn our paper and spreadsheets into an app.”“Can we talk even if the data is confidential?”“I wish there were an app for this.”“Our website needs a fresh start.”“I have an idea that isn’t a thing yet.”
Privacy Policy
結 -MUSUBI- (“we”) handles personal information in accordance with the following policy.
1. Information We Collect
Through our contact forms (project inquiries, and feedback or app ideas), email or phone, we may receive your name, company or business name, email address, phone number and the details of your inquiry. When you submit a form, the service that receives it may record the sending device’s IP address and browser type to filter out spam.
2. Purpose of Use
We use this information only to respond to inquiries, to propose and provide services, and to handle contracts. App ideas you send help us decide which apps to build (if we build an app based on an idea, no payment is made to the person who sent it).
3. Third-Party Disclosure
Except where required by law, we do not disclose personal information to third parties without consent.
4. Service Providers (Including Providers Outside Japan)
Form submissions are received and stored by Netlify, Inc. (United States), and inquiry emails are received and sent through Google LLC (Gmail, United States). Netlify may use Automattic Inc. (Akismet, United States) to filter out spam. We use AI (Claude, by Anthropic, PBC, United States) to organise inquiries and draft replies; replies are sent by our staff. This site also uses Google Fonts (Google LLC) to display text, so opening a page sends your device’s IP address and similar data to Google. Information on the personal information protection system of the United States is available from Japan’s Personal Information Protection Commission (“Foreign systems: United States”, in Japanese).
5. Retention
Form submissions and their notification emails are deleted one year after we receive them. Records related to contracts are kept for the period required by law.
6. Requests About Your Information
To ask us to disclose, correct, delete or stop using your information, please contact us below. We will confirm your identity before responding.
7. Contact
For questions about this policy, please contact us at: 結 -MUSUBI- (Masaki Kushida) / musubi.bss@gmail.com
8. Changes
We will post any changes on this page. (Revised October 25, 2026)
Legal Notice (Specified Commercial Transactions Act)
| Business Name | 結 -MUSUBI- |
|---|---|
| Responsible Person | 串田 聖希 |
| Address | Disclosed promptly upon request |
| Contact | musubi.bss@gmail.com (Inquiries accepted through the contact form or by email) |
| Price | As stated in the individual quote or order form (tax included) |
| Additional Fees | None, unless otherwise noted in the quote (e.g. travel expenses) |
| Payment Method | Bank transfer |
| Payment Timing | As stated in the individual contract (typically within 30 days of invoice) |
| Service Timing | As stated in the individual contract |
| Cancellation / Refunds | Due to the nature of the service, refunds after work has begun are generally not available. Details are set out in the individual contract. |