Contact Information

Need help or want to collaborate? Our team is available through live chat, Email, AI assistant, messaging platforms, phone, and in-person access from our Tokyo headquarters.

Or use the contact form

Business Hours

Monday-Friday, 9:00-17:00 JST (Except Japanese Public Holidays).

Access & Directions

Visit the access page

Work Inquiries

Email: info@dei.so

English Address

Level 21 Shiodome Shibarikyu Building 1-2-3 Kaigan, Minato-ku 105-0022 Tokyo, Japan.

Japanese Address

〒105-0022 東京都港区海岸1-2-3 汐留芝離宮ビルディング21階, 合同会社DEISO.

Phone (JP)

03-5403-6479 (Japanese)

WhatsApp chat

Prefer to chat on WhatsApp? You can reach our agents directly via WhatsApp for any inquiries, assistance, or personalized recommendations. Whether you want to discuss your project needs or explore our premium training programs, we're here to help. Contacting us outside business hours? Just leave your message, and one of our agents will get back to you as soon as possible.

Phone (EN)

070-6969-7700 (English)

Live Chat

Talk to a DEISO Agent – We're Here to Help Start a live chat with one of our team members to discuss your needs or get your questions answered. f you're contacting us outside business hours, no worries—just leave your message, and one of our agents will get back to you as soon as possible.

Fax

03-5403-6475

AI Assistant

Have a quick question about DEISO’s services, digital products, or training programs? Whether you need support for a project, help with environmental legislation, or personalized recommendations—Mirai AI is here to assist. Use Mirai to explore our website, find the right service or product, and get instant answers.

AI Support

Let DEISO AI help you solve problems quickly and efficiently. Get issues diagnosed and fixed—no need for manuals. You'll receive simple, step-by-step instructions instead.

Support Ticket

Having a technical issue that needs human support? Submit a support ticket for any of our platforms—EcoIN Data AI, Visly, Spark, Grid, and more. Our team is here to help.

Send us a Voice Message

Prefer to speak instead of type? Feel free to leave us a voice message—quick, easy, and accessible for everyone.

Engineering the Future of Sustainable Performance

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