Kazuma Ieiri
Founder & Outside Director @ BASE
Tokyo, Japan
Kazuma Ieiri is a seed investor at BASE in Tokyo focused on Content and Fashion. Born in 1978 and raised in Fukuoka prefecture, Kazuma founded paperboy&co. inc. (currently GMO Pepabo) and went on to become the youngest CEO ever (at the time) to take a company public in Japan by taking paperboy&co. public on the JASDAQ Japanese stock exchange. After leaving paperboy&co, he continued his startup trail by foundingBASE, CAMPFIRE, and XIMERA. Kazuma also dabbled in the food services industry via the founding of On The Corner (a cafe) and is active in the startup investment scene. He also started the Liverty-house project which attempts to create shared housing for young people in need.
- Total investments:
- 18
- Last investment:
- Lead investor:
- 6%
Last updated:
For AI agents: llms.txt
Industries Kazuma Ieiri invests in
Stages Kazuma Ieiri invests in
Countries Kazuma Ieiri invests in
Round sizes
Round size
- Seed
- $380k–$41M
- Angel
- $1M–$7.4M
- Series A
- $3.5M–$47M
Investment Focus
Industry
- Content 4 (22%)
- Fashion 3 (17%)
- FinTech 2 (11%)
- Finance 2 (11%)
- Software 2 (11%)
Stage
- Seed 10 (56%)
- Angel 4 (22%)
- Series A 2 (11%)
- Funding Round 2 (11%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
Wunderbar
|
Wunderbar provides intellectual property along with branding and marketing services. | $3.5M / Series A / Jun 25, 2025 | |
Be-A Japan
|
Bé-A Japan producer and distributor of fashion accessories. They provide products that include underwear, sanitary napkins, interior goods, fashion accessories, health foods, and cosmetic products. They offer products that are available for shopping online. | $25.5M / Jun 07, 2021 | |
|
Be-A Japan
|
Bé-A Japan producer and distributor of fashion accessories. They provide products that include underwear, sanitary napkins, interior goods, fashion accessories, health foods, and cosmetic products. They offer products that are available for shopping online. | $1.6M / Seed / Jun 07, 2021 | |
Yutori
|
Yutori is engaged in retailing and wholesaling apparel goods and creating brands reflecting diversity in digital culture through media and individual stories. The company does everything from product planning to sales in-house, without intermediary distributors or retailers. Until now, the company has used various tools such as e-mail,spreadsheets, and SMS messages to exchange data. | Seed / Jun 18, 2019 | |
Discover Japan
|
Established in May 2018, the Company completed the transfer procedure for the Discover Japan business unit from EI Publishing, and started its business as a new company on November 26, 2018. The magazine Discover Japan, launched in 2008, continues to disseminate Japanese culture such as traditional manufacturing, design, clothing, and landscape. InJanuary 2020, the magazine “Discover Japan”. Magazine was launched in the 10th year milestone, in addition to magazines, digital, technology, commerce, experience, product development, store, promotion, branding, in addition to magazinesto further develop the Discover Japan brand. On November 27, 2018, we signed a capital and business alliance with CAMPFIRE. The company utilizes the expertise of financing such as jitsugen specializing in CAMPFIRE and SYNERGY's business to address issues related to Japanese culture transmitted by media such as magazines and the web.We aim to convey the values of Japanese culture such as food, inn, culture, things, things, things, things, and people” not only in Japan, but also to the world. | Seed / Nov 27, 2018 | |
CoCooking
|
CoCooking uses food and cooking to create ample opportunity for dialogue and thought, fostering creativity, diversity, and well-being of individuals and communities. | $380K / Seed / Aug 10, 2018 | |
One Nova
|
One Nova (ワンノバ) is a lifestyle brand and online platform that offers a range of innerwear products, such as men's boxers. | $2.8M / Angel / Aug 01, 2018 | |
Vivid Garden
|
vivid garden is an Agriculture company. | $5.7M / Angel / Feb 08, 2018 | |
Taliki
|
Taliki is a Coworking Space Operates Social Entrepreneurs Development Support for Intrepreneur Development. | Seed / Dec 25, 2017 | |
10x
|
10x provides One-stop service from meal planning to grocery shopping. | $7.9M / Seed / Dec 20, 2017 | |
| See all 18 investments → | |||
Co-Investors
About BASE
BASE provides web-based services that develop and build e-commerce platforms. The company provides its services across Japan, such as net shop creation, development of shopping applications, development of online payment, and other services.
BASE Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Yuta Tsuruoka
Representative Director & CEO
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Jinguuji Masahito
Operating Officer
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Kazuma Ieiri
Founder & Outside Director
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Ken Harada
Director & CFO
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Kenichi Takano
CEO
|
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FAQ
What does Kazuma Ieiri invest in?
Kazuma Ieiri invests primarily in Content, Fashion and FinTech startups, most often at Seed and Angel stage. Most of the 18 investments tracked by Shizune back companies in Japan. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What is Kazuma Ieiri's check size?
Kazuma Ieiri typically joins rounds of $380k–$41M at Seed, $1M–$7.4M at Angel and $3.5M–$47M 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 Kazuma Ieiri participates in.
When did Kazuma Ieiri last invest?
The most recent investment recorded for Kazuma Ieiri closed in Jun 2025. Shizune tracks 18 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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