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.
30 min · Free · 1-month trial · Min. 3-month contract
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.
Advisory Cost vs. Savings
A ¥50K/month investment delivers outsized returns.
Annual Cost Comparison
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.
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
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
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
Real results from real clients.

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

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
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
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 ConsultationTrusted By
Companies using our generative AI advisory service.
Let's start with a casual conversation
Book a Free 30-min ConsultationWho is your advisor?
Not a consultant who just hands you a report. This person works with you directly.

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)
Photo: Google Cloud BlogHow 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 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
Websites, servers, databases, security. Because we see the whole system, we make better decisions.
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.
3 simple steps
30-minute free consultation → start immediately.
30-minute free consultation
Tell us your challenges. We'll explain how an advisor can help.
1-month trial
Start with 1 month to check the fit. If it's not right, no obligation to continue.
Slack — instant start
Invite us to your Slack and ask anything from day one.
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
¥55,000 incl. tax
- Online meetings: 2/month
Up to 1 hour each - Slack support: 1 hr/month
- —On-site consulting: N/A
Standard Plan
Weekly meetings, steady progress
¥99,000 incl. tax
- Online meetings: 4/month
Up to 1 hour each - Slack support: 2 hrs/month
- —On-site consulting: N/A
Basic Plan
Most popular. For serious use
¥165,000 incl. tax
- Online meetings: 5/month
Up to 1 hour each - Slack support: 5 hrs/month
- —On-site consulting: N/A
Premium Plan
Full partnership
¥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
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.
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
You could be next
Book a Free 30-min ConsultationAI 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).
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.
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