System × International

Transform society
with will
and technology.

Giving shape to what people set out to do.

Giving what you set out to do a working form. Using technology and language as the means, we run a system business covering AI, automation and app/web development, and an international business covering English and Japanese lessons and travel guidance — from first conversation through to operations, in Japanese and English.

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Business

System business
and international business.

We run two businesses: AI and system development, and language lessons with travel guidance.

SYSTEM

System BusinessAI, automation, apps and the web

Wherever AI and better systems can take repetitive day-to-day work off your hands, we automate it — so your team's time goes to the work only people can do. Support for DX and AX, from requirements through to operations.

  • AI Consulting & Business AutomationGenerative AI adoption, routine task automation, internal tool integration. We start where impact is highest.
    AI / DX
  • Application DevelopmentLINE Bots, booking/entry forms, e-commerce, SaaS, internal systems. Proven track record with companies and municipalities.
    App
  • Website DevelopmentCorporate sites, landing pages, multilingual sites. Domain, hosting, and ongoing updates included.
    Web
  • Maintenance & OperationsOngoing support for existing sites, LINE Bots, and web apps. Peace of mind on a monthly plan.
    Ops
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INTERNATIONAL

International BusinessLanguage lessons and travel guidance

A licensed teacher with TOEIC 970. Online English and Japanese lessons, plus travel guidance available anywhere in Japan for visitors from overseas.

  • Online English LessonsBusiness English, TOEIC prep, pre-assignment training. One-on-one with questions in Japanese.
    English
  • Online Japanese LessonsConversational & business Japanese for professionals — taught in English when needed.
    日本語
  • Travel GuidanceAvailable anywhere in Japan: itinerary planning, interpretation and accompaniment on the day.
    Travel
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System ∩ International

Translation and implementation,
without the handoff.

  • Multilingual site development
  • AI for inbound operations
  • System rollout with translation
  • Dev teams with overseas engineers
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Products

Our own products

Alongside client work, we build and run our own products — the ones we wanted for our own day-to-day work.

AI Agent — Web / PWAClosed beta
AiRA app icon

AiRA

Tasks, budget, schedule — just say it.

A personal AI agent that handles task management, household budgeting, calendar and a daily brief entirely through chat. It runs in the browser, and installs to a phone home screen as a PWA.

  • Tasks
  • Budgeting
  • Calendar
  • Daily brief
Marketing Ops — WebClosed beta
AiRA for Marketing app icon

AiRA for Marketing

Every channel a shop publishes on, in one place.

Brings together the store information and reviews scattered across Google Business Profile, Instagram, restaurant directories and a shop's own site. Reputation, findability and listing consistency land in one weekly briefing, with AiRA drafting the fixes and helping apply them.

  • Review replies
  • SEO / AIO audit
  • NAP consistency
  • Weekly briefing
AiRA screen

AiRA

AiRA for Marketing screen

AiRA for Marketing

Koji Aihara, Founder
TOEIC 970Teaching LicenseVPoE Experience
Representative

Koji AiharaFounder / Engineer

After working as an in-house SE and then as VPoE at a development company, founded WillTech Innovations in 2025, having run the full development lifecycle — proposals, requirements, management, implementation and QA. Will — giving people's intent and ideas a working form — is what I care about most. Technology and language are both tools for that.

  • 2021 – 2022In-house SE
    In-house SE, Graduate Recruitment Division

    Led initiatives to improve application rates — from planning through implementation and measurement. Also led development platform migration.

  • 2023 –VPoE
    VPoE, Development Company

    Led a development organization of ~20 international engineers. Handled pre-sales proposals, requirements, project/team management, implementation, and QA.

  • 2025 –Founder
    Founded WillTech Innovations

    FinTech SaaS development and project management, plus FDE (Forward Deployed Engineer) work driving DX/AX for enterprises.

TOEIC970
License
Languages
Works

Works

From enterprises and municipalities to local shops — we take on projects of any size.

Greeedy corporate website home page
Website

Greeedy

Corporate site design, development, and operations

Reborn official LINE account booking bot screen
LINE Bot

Reborn Health Salon

Official LINE × Google Calendar booking bot

TEENS ROCK IN AICHI band entry form
Application

TEENS ROCK IN AICHI

Event entry form development

View all works
FAQ

Frequently Asked Questions

Is the consultation free?

Yes. The first 30-minute online consultation and a 25-minute lesson trial are free.

Can I hire you remotely?

Development and lessons are fully online. Travel guidance is available anywhere in Japan.

Do you work in English?

Yes. All services are available in English, and inquiries in English are welcome.

What payment methods do you accept?

Bank transfer or credit card. Lessons can be monthly or ticket-based.

Contact

Feel free to get in touch.

Your request does not have to be fully defined yet. Just tell us what you are struggling with.

System

Development & AI inquiry

One sentence is enough. After a free 30-min call, we will propose an approach and estimate.

Go to inquiry form
International

Trial lesson & travel guidance

Send us your request for a free 25-minute trial lesson or travel guidance through the form, and we'll arrange the schedule together.

Contact form