# Kotaro Chiba

> Kotaro Chiba is a seed investor at Wamazing (Tokyo) backing Content and Information Technology. See 70 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Wamazing](https://shizune.co/investors/profile/wamazing)
- Location: Tokyo, Japan
- Total investments: 70
- Last investment: Jun 2025
- Lead investor: 7%
- Last updated: Aug 2026
- LinkedIn: https://www.linkedin.com/in/kotaro-chiba-557bb7
- X (Twitter): https://twitter.com/chibakotaro
- Facebook: https://www.facebook.com/chibakotaro

Kotaro Chiba is a seed investor at Wamazing in Tokyo focused on Content and Information Technology. Kotaro Chiba is the founder of ChibaDojo Fund. Kotaro Chiba attended Keio University.

## Round sizes

| Stage | Round size |
| --- | --- |
| Seed | $700k–$30M |
| Series A | $13M–$75M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Content | 8 | 11% |
| Information Technology | 8 | 11% |
| Artificial Intelligence | 8 | 11% |
| Apps | 7 | 10% |
| Travel | 7 | 10% |

130 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Seed | 28 | 40% |
| Funding Round | 12 | 17% |
| Series A | 7 | 10% |
| Angel | 6 | 9% |
| Series B | 5 | 7% |

10 stages tracked in total.

### Country

| Country | Investments | Share |
| --- | --- | --- |
| Japan | 58 | 83% |
| United States | 2 | 3% |

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Paradigm AI | Paradigm AI is an entertainment firm that produces songs and creates virtual human idols using generative AI. |  | Seed | Jun 29, 2025 |  |
| Nstock | Nstock is specialized in developing SAAS based applications for ecosystem. | $21M | Seed | Sep 09, 2024 |  |
| Oyraa | Oyraa provides online meetings and conference apps. Their interpreters will help you communicate not only in business but also in personal situations, such as in hospitals and real estate agencies. | $1.7M | Seed | Jun 10, 2024 |  |
| MOV | MOV is a technology platform. They offer SaaS for stores that can collectively manage word-of-mouth sites and visualize and analyze customer feedback. It distributes inbound market data, news, and know-how to domestic companies. Their services include inbound support and consulting. | $9.6M | Series B | May 21, 2024 |  |
| Orange | Orange is a developer of a variety of deep-learning models with a focus on computer vision and natural language processing for comics. | $19M | Seed | May 06, 2024 |  |
| Paradigm AI | Paradigm AI is an entertainment firm that produces songs and creates virtual human idols using generative AI. |  | Seed | May 03, 2024 |  |
| Japan Wind Tunnel Manufacturing | Japan Wind Tunnel Manufacturing focuses on the development and production of compact wind tunnel testing systems for wind power generators. The company designs technologies that enable stable airflow at shorter tunnel lengths and reduced system size. Its equipment is used for testing and evaluating wind power generation systems and supports thereduction of infrastructure and operational requirements associated with conventional wind tunnel facilities. | $4.4M | Venture - Series Unknown | Sep 01, 2022 |  |
| Contrea | MediOS is a cloud-based informed consent (IC) assistance system that assists medical professionals in focusing on essential patient explanations. Many doctors respect explanation time and go out of their way to clarify things so that patients can receive therapy with confidence and peace of mind. | $1.2M | Seed | Nov 16, 2021 |  |
| Cocon | Cocon engages in the cybersecurity and AI/ automation business..The company was founded in 2013 and is based in Tokyo, Japan. | $276.5M | Convertible Note | Dec 08, 2020 |  |
| KAUCHE | X Asia creates enjoyable shopping experience. | $24.9M | Seed | Nov 30, 2020 |  |

10 of 70 investments shown.

## Co-investors
- [SMBC Venture Capital](https://shizune.co/investors/profile/smbc-venture-capital) — VC Fund, 7 deals together
- [ANRI](https://shizune.co/investors/profile/anri) — VC Fund, 6 deals together
- [Vector](https://shizune.co/investors/profile/vector-inc-) — VC Fund, 6 deals together
- [Coral Capital](https://shizune.co/investors/profile/coral-capital) — VC Fund, 5 deals together
- [East Ventures](https://shizune.co/investors/profile/east-ventures) — VC Fund, 5 deals together
- [500 Startups Japan](https://shizune.co/investors/profile/500startups-japan) — VC Fund, 4 deals together

## About Wamazing

VC Fund · Tokyo, Japan

WAmazing provides free subscriber identification module (SIM) cards that allow foreign travelers to register before their arrival in Japan. Through an app, WAmazing also provides tourists with free internet services of up to 500MB. The service aims to prevent visitors from being locked out of free wifi because of sign-up pages in Japanese thatdemand a local phone number.WAmazing was founded in 2016 and is based in Tokyo, Japan.

5 contacts available at Wamazing.

| Name | Title | Profile |
| --- | --- | --- |
| Fumiko Kato | CEO | https://shizune.co/investors/profile/fumiko-kato |
| Kotaro Chiba | Management Advisor | https://shizune.co/investors/profile/kotaro-chiba |
| Kotaro Chiba | Management Advisor | https://shizune.co/investors/profile/kotaro-chiba-0d07 |
| Yuichi Tateno | CTO | https://shizune.co/investors/profile/yuichi-tateno |
| Yusuke Asakura | Management Advisor | https://shizune.co/investors/profile/yusuke-asakura-656e |

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### Similar stage
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## FAQ

### What does Kotaro Chiba invest in?

Kotaro Chiba invests primarily in Content, Information Technology and Artificial Intelligence startups, most often at Seed and Funding Round stage. Most of the 70 investments tracked by Shizune back companies in Japan. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Kotaro Chiba's check size?

Kotaro Chiba typically joins rounds of $700k–$30M at Seed and $13M–$75M at Series A. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Kotaro Chiba participates in.

### When did Kotaro Chiba last invest?

The most recent investment recorded for Kotaro Chiba closed in Jun 2025. Shizune tracks 70 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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