Eternal Inc. — Osaka, Japan
In most companies, "AI adoption" ends the moment the tools are handed out. We build something different: AI staff that carry out routine work — and hand every decision that matters to a person.
We test every system on our own company first, across Finance, Strategy and Sales. What fails is recorded alongside what works, and both feed straight back into the design.
What we bring to clients outside Japan is not a translated deck. It is the system we run on our own company — starting with one business process at a time.
What gets easier
Plain examples from our own company, as of 14 September 2026.
A single daily message on LINE (the messaging app most used in Japan) is being tested. It sorts the last two days of email into three groups: written by a person, for information, and sales or newsletters. Everyone who wrote to you personally is listed by name and subject, so they are not lost among automated notices.
It only reads and labels. It never replies, archives, marks as read or deletes anything. Whether a reply is needed is always your decision, not the AI's.
Invoices are matched against incoming payments. Anything billed but not received is flagged once it passes its due date, and the same payment recorded twice is caught before it distorts the numbers.
Bank data still arrives as a CSV file that a person exports; the matching and flagging after that are automatic. An earlier version missed two of three real double entries in our own books, so we tightened the rule on 12 September 2026.
When the AI finds something that needs a decision — an unrecognised payment, a possible duplicate — it does not fix it on its own. It places the item in a review queue, and a person approves or rejects it.
Our AI does not send email or messages outside the company on its own. This is built into the system, not left to good behaviour.
How it works
Every one of our AI staff moves through the same sequence.
They gather the facts — bank records, payments, invoices, email — on a fixed schedule, without being asked.
They point out what an owner cannot afford to miss: overdue payments, unrecorded transactions, and the shortfall against the monthly target.
Only what a person has approved becomes a task. No task can be marked complete without supporting evidence.
Measured, not promised
Figures measured 12–14 September 2026.
Every 15 minutes · while the founder's Mac is on
Our finance checks run every 15 minutes while the founder's Mac is on. When it is off, a cloud job takes over, but in practice it runs only every few hours (6 runs in 24 hours, measured 14 September 2026).
678 automated tests passing
Across our four internal systems, 678 automated tests pass as of 13 September 2026.
Evidence required to close any task
An AI proposal becomes a task only after the CEO approves it. A task marked complete without evidence is rejected by the database itself — not by policy, but by design.
And what we have not yet built. Among our departments, only Finance runs scheduled checks. In Strategy and Sales, AI drafts and a person decides.
We would rather tell you that now than after you have signed.
How we build
Four rules we keep on every project.
Where we actually are
Each feature is clearly labeled with its development stage, so nothing here reads as larger than it is.
| Live | AI President (runs the company: routes work to each AI department and brings only the decisions that need the CEO) |
|---|---|
| Testing | CONTROL TOWER (sees the company) · AI Finance (protects cash) · AI PR (takes our work to the market) |
We are not selling a finished product. We work as the partner who builds it and corrects it in front of you.
The first step
The scope is fixed in writing before we begin. We do not redraw the line afterwards.
¥300,000 (tax included, approx. USD 2,000 as of Sept 2026)
Three companies only · paid in full up front
Founder
Only what we can substantiate about ourselves.
We test every system on our own company first, with AI staff working in Finance, Strategy and Sales. 678 automated tests pass as of 13 September 2026.
Twenty years spent supporting people. Twenty-five years spent chasing the technology. AI is what finally joined them into one line of work.
More than 10,000 engagements in one-to-one support and operational redesign — years spent listening, on the front line, for where people get stuck and what they cannot yet put into words. He founded Eternal Inc. in March 2019.
Contact
We work in English and Japanese. As a rule, you will hear back from us by the next business day, Japan time.
English replies are drafted by AI and reviewed and sent by Seiko Kubota, our founder, personally.
Eternal Inc. · Kyoei Bldg. 309, 2-8-11 Shibata, Kita-ku, Osaka 530-0012, Japan