40+ Companies Supported

An AI advisor that pays for itself.

Your "gatekeeper" against vendor overcharges and bad AI investments. Example: ¥1.7M quote → ¥1M. From ¥50,000/month.

Book Free Consultation

30 min · Free · 1-month trial · Min. 3-month contract

Technical Advisor
Why it pays for itself

The advisory fee pays back many times over

¥50K/month investment → tens to hundreds of thousands in savings.

Example: ¥1.7M quote → ¥1M

We sit in on vendor meetings, spot unnecessary features and inflated estimates. We know tech — so we know what to cut. ¥700K saved = 14 months of Light plan fees.

"That can be done with AI" — one sentence saves millions

Manual tasks hiding in your workflows can often be automated with AI. We find them and propose solutions. The labor cost savings are enormous.

Stop bad AI investments before they happen

"Let's adopt ChatGPT because it's trending" — but is it right for your problem? An expert on the front lines prevents wasteful spending.

Ask on Slack, get instant answers

"Can AI do this?" "Is this quote fair?" — ask on Slack, get immediate answers. No more wasting time and effort researching on your own.

9 years at Toshiba + 40+ companies advised

An engineer with 9 years at a major corporation provides direct support. Understands both enterprise complexity and startup speed — so advice is always practical.

For ¥50K/month, prevent millions in wasted vendor spending.

Why It Pays For Itself

Advisory Cost vs. Savings

A ¥50K/month investment delivers outsized returns.

Annual Cost Comparison

AI Advisor (Light Plan)¥600K/year
IT Consulting Firm¥1.8-6M/year
Hire AI Engineer Full-Time¥8-15M/year

Up to 96% cost reduction vs. hiring

Vendor Quote Compression

Before

¥1.7M

After

¥1.0M

¥700K saved

Legal AI Operating Cost

Before

100%

After

60%

40% reduction

Hiring AI Talent vs. Advisor

Before

¥12M/year

After

¥600K/year

¥11.4M/year saved

One vendor quote review pays for 14 months of the Light plan.

Track Record

Numbers that speak

40社+

40+ companies supported (including individuals)

9年

9 years at Toshiba R&D (joint projects with Google & McKinsey)

AWS 全12冠

All 12 AWS certifications in ~1 month (first in Toshiba Corporation)

2大会 連続受賞

YC Hackathon + Builders Weekend

2 AI services developed and running
YCombinator hackathon technical award (Toranomon Hills Mori Tower)
Builders Weekend 2026 Tokyo — VoiceOS Award (Digital Garage co-organized, 205 participants, back-to-back wins)
Patent holder (Patent No. 7086873)
University of Tokyo × Toshiba AI Training — 2nd Prize, Session A (highest-level in-house AI training)
Toshiba Internal CTF 2022 — 5th / 68 teams (CISO role Level 5, top level)
DICOMO2014 Best Presentation Award (1st / 293 as a grad student) + Outstanding Paper Award
MOVIDA SCHOOL 2nd cohort (Taizo Son's acceleration program)
IPSJ DPSWS2014 Excellent Poster Award (top 3)
JSSST 42nd Annual Conference — Invited Tutorial Lecturer (past lecturers: UTokyo, AIST, Osaka Univ. professors)
TakeOff Tokyo 2026 — Pitched & Exhibited (Asia's largest startup conference, 50-company pitch contest)

AWS Certified — All 12 Certifications

SA ProfessionalDevOps ProfessionalSA AssociateDeveloperSysOpsCloud PractitionerNetworkingData AnalyticsDatabaseMachine LearningSecuritySAP on AWS
AI Technology
What We Do

What does a generative AI advisor do?

Think of it as a "tech lawyer" — but for AI and IT decisions.

Just ask on Slack. AI questions, system issues, vendor negotiations — we handle it all.

Vendor Gatekeeper

Quote reviews, tech selection, requirements validation. We make sure you're not being overcharged

AI Help Desk

"Can AI do this task?" — instant answers with implementation plans included

Development Direction, Clarified

Prototype direction proposals, PoC design oversight — because we understand the tech, we guide the right decisions

Sound Familiar?

4 signs you need a generative AI advisor

If even one applies, a generative AI advisor saves you money.

Can't tell if vendor quotes are fair or inflated

"AI system development: ¥5M" — is that reasonable? Without tech expertise in-house, you're paying whatever they ask.

Want AI but don't know where to start

ChatGPT? Claude? Custom build? SaaS? Too many options. Before spending money in the wrong direction, it's faster and cheaper to ask an expert.

Want to hire AI talent but can't find or afford them

AI engineer salaries: ¥8-15M/year. An advisor at ¥50K/month = ¥600K/year. Less than one-twentieth the cost of hiring.

Afraid of long-term commitments holding you back

Scared of a 6-month lock-in? Just try 1 month. If it's not the right fit, stop there. Our minimum commitment after the trial is just 3 months — no long-term contracts like others impose.

Case Study

Case Study

Real results from real clients.

Rikiman Co., Ltd.
Manufacturing (Construction Hardware)Rikiman Co., Ltd.

Challenge

Inspection documents were handwritten, unable to assess vendor quote validity, and struggling with ERP system development vendor management. The all-hands-on-deck approach was reaching its limits.

Solution

AI automation of shipping label creation, technical review of vendor quotes, and negotiation support with ERP development vendor. Serving as an external IT supporter to assist management decisions.

Result

90% reduction in shipping label creation time (deployed across all locations), vendor quote compression, ERP development course correction

Having someone who understands IT as a supporter for our company — that alone makes such a difference in our peace of mind.

Rikiman Co., Ltd. Tokyo Branch Manager Isoda Takehito

ExaEdge Co. Ltd.
ExaEdge Co. Ltd.

Challenge

Legal AI had low accuracy and slow processing. No AI talent in-house to fix it.

Solution

AI accuracy tuning + server architecture optimization — improved both performance and speed.

Result

40% reduction in operating costs

With Leach's technical support, our legal AI evolved dramatically. Achieving both cost reduction and performance improvement was a significant achievement.

ExaEdge Co. Ltd. CEO Nishikawa

Japan Joint Solutions Co., Ltd. (Minato HD Group, TSE Standard Listed)
Japan Joint Solutions Co., Ltd. (Minato HD Group, TSE Standard Listed)

Challenge

AWS environment had grown complex with no visibility into the overall architecture. Cost and security issues were unclear.

Solution

Engineer with all 12 AWS certifications created architecture diagrams, investigated network paths, analyzed costs, and proposed security improvements.

Result

Full AWS visibility, cost reduction, and security risk clarification

Web ConsultingFreelance Engineer (Job Board Development Project)

Challenge

Frontend was complete, but the outsourced backend was unfinished and built with PostgreSQL instead of the specified DynamoDB.

Solution

Created DynamoDB schema design, compared suitability of DynamoDB vs PostgreSQL, proposed optimal DB selection and backend remediation plan. Organized the path from local environment setup to deployment.

Result

Optimized DB design and recovery to deployable state

* Design and consulting included in advisory service. Development implementation is quoted separately.

Facing similar challenges?

Book a Free 30-min Consultation

Let's start with a casual conversation

Book a Free 30-min Consultation
Your Advisor

Who is your advisor?

Not a consultant who just hands you a report. This person works with you directly.

Takuya Tominaga

Takuya Tominaga

CEO, Leach, Inc.

Spent 9 years at Toshiba Software Technology Center, working alongside Google and McKinsey on cutting-edge data projects. Achieved all 12 AWS certifications in approximately one month (first in Toshiba Corporation). After visiting workplaces across Japan and witnessing staff using rulers on monitors to reconcile documents, founded Leach in 2024.

Toshiba R&D

9 years. Joint projects with Google & McKinsey. Youngest to be assigned to subsidiary executive office

AWS All 12 Certs

Achieved all 12 certifications in ~1 month. First in Toshiba Corporation

YC Hackathon

Won Technical Award at YCombinator's 'c0mpiled'. 200+ participants from around the world

Founded Leach

November 2024. Generative AI-focused startup. 40+ companies supported

JSSST Invited Lecturer

Tutorial lecturer at Japan Society for Software Science and Technology 42nd Annual Conference. Invited alongside professors from UTokyo, AIST, and Osaka University (Sep 2025)

Toshiba Tec × Google data business project (during Toshiba tenure)

Toshiba Tec × Google data business project (during Toshiba tenure)

Photo: Google Cloud Blog
What Sets Us Apart

How we're different from other AI advisory services

We don't just give advice — we understand the tech behind it.

We build our own AI products

We build our own AI products

We develop and operate Totsugo and Saturn ourselves. Not theoretical advice — real-world experience from someone who builds and sells AI products.

Not just AI — we understand everything

Not just AI — we understand everything

Websites, servers, databases, security. Because we see the whole system, we make better decisions.

Advisory fees are an investment with proven ROI

Advisory fees are an investment with proven ROI

Vendor quote compression, labor savings from automation. We're obsessed with delivering multiples of the advisory fee in value.

How to Start

3 simple steps

30-minute free consultation → start immediately.

01

30-minute free consultation

Tell us your challenges. We'll explain how an advisor can help.

02

1-month trial

Start with 1 month to check the fit. If it's not right, no obligation to continue.

03

Slack — instant start

Invite us to your Slack and ask anything from day one.

Pricing

AI Advisor Pricing Plans

From ¥50K/month. Dramatically cheaper than hiring AI talent. The Standard Plan (¥99,000 incl. tax) can be approved by a section manager.

Start with 1-month trial → move to 3-month contract when ready.

※ Clients who sign at the current rate are locked in for the contract period (3 months) even after price increases.

Light Plan

Try us out

50,000JPY (excl. tax)/mo

¥55,000 incl. tax

  • Online meetings: 2/month
    Up to 1 hour each
  • Slack support: 1 hr/month
  • On-site consulting: N/A
Book Free Consultation
Manager approval OK

Standard Plan

Weekly meetings, steady progress

90,000JPY (excl. tax)/mo

¥99,000 incl. tax

  • Online meetings: 4/month
    Up to 1 hour each
  • Slack support: 2 hrs/month
  • On-site consulting: N/A
Book Free Consultation
Most Popular

Basic Plan

Most popular. For serious use

150,000JPY (excl. tax)/mo

¥165,000 incl. tax

  • Online meetings: 5/month
    Up to 1 hour each
  • Slack support: 5 hrs/month
  • On-site consulting: N/A
Book Free Consultation

Premium Plan

Full partnership

300,000JPY (excl. tax)/mo

¥330,000 incl. tax

  • Online meetings: 10/month
    Up to 1 hour each
  • Slack support: 7 hrs/month
  • Priority response (ahead of other plans)
  • On-site consulting: on request
    Travel & accommodation billed separately
Book Free Consultation

Development & More

Custom development & implementation

  • AI system development & implementation
  • AI integration into existing systems
  • Infrastructure setup & migration support

When advisory plan design & proposals require hands-on development. Quoted individually based on scope.

Custom QuoteContact Us

Client Testimonials

Reviews on MENTA — 29 total, 4.9 average

I consulted on a case that other mentors couldn't solve! The guidance led me to solutions from perspectives no one else could provide! I was continuously amazed by the brilliant approaches!!

S

Results exceeded expectations. Tominaga-san's technical skills are top-class — I felt there was no error he couldn't resolve. Wonderful personality too. Very satisfied.

Yuzushiba

I had environment-specific security errors, but Tominaga-san leveraged his experience at a major corporation to handle them carefully. Not many people can deal with these issues — truly a high-level professional.

Fujihara

I requested a design review for blockchain development. Beyond design documents and technical advice, I received extensive guidance on blockchain-specific issues and implementation methods. Very valuable.

Mikan

I was struggling with authentication and authorization implementation. The guidance was extremely helpful! A very skilled engineer!

Masa

Despite my sudden request, he kindly took on my consultation. He supported the entire process of deploying to a Sakura server via GitHub with Laravel. As a beginner, I'm grateful for the thorough and detailed guidance.

otayuria

Thank you for the short but productive time! You answered every question and even helped me create a learning roadmap.

aiueo5000

I consulted about infrastructure and cloud architecture. The responses were extremely thorough and very helpful.

hikaru.coupe

Thank you for all the incredibly helpful advice!!

schwarzwald

I had a casual consultation about work-related topics. Mainly discussed API design, and toward the end, even got career advice. The API guidance was spot-on.

Yoshida

He was very attentive in listening to my concerns. I was lost about direction, but now I know what I should do.

Blago188

Received very thorough and accurate guidance on Docker environment setup.

Ryo Ishii

He was very supportive and resolved my issues with reliable skills. Thank you so much!

sorasuke

Quick response, very helpful. I'll consult again for AWS-related issues.

Macaroni

Quick communication and careful support — very helpful.

DFRD

Fast responses, and he shows me what I want to know and provides clear direction. Very easy to work with.

P-2

Received very thorough and kind support!

Shijo

The guidance was easy to understand and thorough — very helpful.

marina00

A very knowledgeable person — I learned a lot.

Dachiko

Answered my questions very thoroughly and kindly.

Maruyama

The answers to my questions were extremely thorough and educational.

Shuichi TANAKA

Clear explanations — very helpful.

Koji1210

I'd be happy to consult again if anything comes up. Thank you!

otayuria

Thorough support — I'm very grateful.

Miki

Very helpful. Thank you.

Taka0130

I'd like to re-contract in a few months.

minhouse10

Thank you.

Nieda Yoshiaki

I may need your help again — thank you for everything.

Nifudo

FAQ

AI Advisor FAQ

Q.How soon can we start?

Same day. Invite us to Slack and start asking immediately.

Q.Can we only ask about AI?

No. Websites, servers, security, vendor selection — anything IT-related is fair game.

Q.Is a 1-month trial really possible?

Yes. Start with 1 month to check the fit. If you'd like to continue, move to a 3-month contract. If it's not a fit, stop there — no obligation.

Q.Does the advisory fee really pay for itself?

For example, a ¥1.7M vendor quote could be compressed to ¥1M. One vendor review can recover months of advisory fees.

Q.What is a generative AI advisor?

A generative AI advisor is a specialist in technologies like ChatGPT and Claude who supports your company's AI adoption on a monthly retainer. They review vendor quotes, develop AI strategy, and provide instant answers to technical questions — like having a tech lawyer for AI decisions.

Q.How is an AI advisor different from a typical IT consultant?

Traditional IT consultants focus on documentation and reports. Our AI advisor is an engineer who actively builds and operates AI products. We can handle everything from prototype creation to PoC development end-to-end.

Q.What does an AI advisor typically cost?

AI advisory services typically range from ¥150K-500K/month in the market. We start at ¥50K/month — the most affordable in the industry — and have achieved over ¥700K in vendor cost savings in a single engagement. Compared to hiring an AI engineer at ¥8-15M/year, our service costs just ¥600K/year.

Q.Is it remote only? Can we meet in person?

Light, Standard, and Basic plans are online (Slack + Google Meet). The Premium plan (¥300K/month) offers on-site consulting on request (travel and accommodation billed separately).

40+ Companies Supported

Start with a 30-minute free consultation

"Do we even need an AI advisor?" — we'll help you figure that out in the free consultation.

Book Free Consultation