Mission
Building a society that doesn't rely on human hands — but never leaves people behind.
We build "KimiTeras", classroom signage that delivers information to every student, and provide AI/DX consulting that turns field know-how into reusable knowledge. A kosen-born startup from Gifu, Japan.
News
News
Service
Services
KimiTeras
A next-generation school DX signage platform connecting schools and communities. Through digital signage installed in high school classrooms, we deliver timely information to support students' daily lives and career choices.
Learn more about KimiTerasGenbaTerrace: signage for factories and offices
AI/DX Consulting
From construction blueprints to salon records and manufacturing manuals — we make unspoken, unstandardized field knowledge visible and reusable.
Get in touchSee the prototypesPartners
Partners
Companies we work with through our businesses. We are sincerely grateful for their continued support.
Company
Company Info
| Company | Rebounder Co., Ltd. |
|---|---|
| Founded | February 19, 2026 |
| CEO | Kaito Okumura |
| Address | 6-25-14 Hongo, Bunkyo-ku, Tokyo |
| Activity Area | Gifu, Japan |
| Capital | 500,000 JPY |
Message
Message from the CEO
Kaito Okumura
CEO, Rebounder Co., Ltd.
KimiTeras, our classroom signage, eases teachers' administrative workload, with advertising covering its running costs — so schools pay nothing. We've built this model step by step through our deployment at Ginan Technical High School. A society that doesn't rely on human hands, yet never leaves people behind — guided by the voices of the field, we keep advancing schools' digitalization.
- Background
- Born and raised in Gifu, Japan. Founded Rebounder Co., Ltd. during his 5th year at the Department of Electrical and Computer Engineering, National Institute of Technology, Gifu College. Currently a 1st-year student in the Advanced Fusion Engineering Program (as of 2026).
- Achievements
- DCON 2025 Finalist & DSF Selected
- Grand Prize, 2nd Gifu Bluvic Idea Project
- Digitech Quest 2025 Grand Prize
- 1st KOSEN Entrepreneur Summit Participant
Contact
Contact Us
Please use the form below to get in touch. We will respond within 3 business days.
Tech Blog
Engineering Blog
Written by the people who actually run these systems in production. Every article records what broke, why, and how it was fixed — down to the file and commit the claim came from.
- Partial Unique Index Closes a Postgres Phantom Race
- Fail-Open Fallback Silently Deletes Other Schools' Ads
- Nested withTenantContext Deadlocks the Pool at Max
- maxKeys: Capping a Rate-Limiter Map Before It OOMs
- Claude Code Desktop Scheduled Tasks: 47% Finish On Time