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Craif

Tokyo, JP · Founded 2018 · Japan corporation · 55 employees on LinkedIn · 16 known investors

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Craif develops biomarker analysis and AI-driven diagnostic solutions to enable early disease detection and personalized treatment through non-invasive testing of body fluids.

AI & Machine LearningBiotechHealthtechMedical Devices

Founders & leadership

Craif was founded in 2018 by Ryuichi Onose.

RORyuichi Onose
Ryuichi OnoseFounderRyuichi Onose co-founded Craif in 2018 and serves as its CEO, working on early cancer detection by combining biotechnology and data science. He previously handled LNG vessel project management and finance at Mitsubishi Corporation, founded a private residence management company in 2016, and studied at Waseda University with time abroad at McGill University in Canada.
YI
Yuki IchikawaNamed on SEC filing
MY
Mika YuiNamed on SEC filing
RO
Ryuichi Onose Takao YasuiFounder

Investors · 16

Global Brainlisted by Global BrainTokyo · $100K

How we know: Global Brain's portfolio page · open dataset · 5k.vc investor directory · Not right? Tell us

Saisei Ventureslisted by Saisei VenturesCambridge

How we know: Saisei Ventures's portfolio page · Not right? Tell us

Aozora Corporate InvestmentreportedTokyo

How we know: craif.com · the VCSheet dataset · Not right? Tell us

Dreamers VCreportedEl Segundo · $500K – $5M

How we know: a partner's Signal profile · Not right? Tell us

Also in the syndicate · 11

Aozora Bank GroupDaiwa House IndustryDaiwa House Industry Co., Ltd.MR Co., Ltd.TAUNS LaboratoriesTAUNS Laboratories, Inc.Toyoda Gosei Co., Ltd.TOYOTA BOSHOKU CORPORATIONUnreasonable GroupUnreasonable SyndicateX&KSKlead

Funding

SEC filings, press & company announcements

$11.3M disclosed across 1 of 3 rounds · 2021–2025

  • Undisclosed amountSeries CMay 2025

    X&KSK (lead), Aozora Bank Group, Daiwa House Industry, TAUNS Laboratories, Unreasonable Group

    Source ↗
  • Undisclosed amountSeries CApr 2025

    X&KSK (lead), Aozora Bank Group, Aozora Corporate Investment Co., Ltd., Daiwa House Industry Co., Ltd., MR Co., Ltd., TAUNS Laboratories, Inc., Toyoda Gosei Co., Ltd., TOYOTA BOSHOKU CORPORATION, Unreasonable Group, Unreasonable Syndicate

    Source ↗
▶$11.3MraisedNov 2021 · 4 investors · Other Health Care
Rule 506(b)
Officers, directors & promoters on the filing
  • Ryuichi OnoseExecutive Officer, Director
  • Yuki IchikawaDirector
  • Mika YuiDirector
Offering amount
$26.9M
Amount sold
$11.3M
First sale
Oct 2021
Incorporated
Corporation, Japan, 2018
Federal exemptions
06b
Full filing on SEC EDGAR ↗

Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.

In the news

Early cancer detection startup Craif raises $22Mtechcrunch.com · May 2025Craif Raises US＄22 million in Series C Funding, Accelerates U.S. Expansion and R&Dcraif.com · Apr 2025

Frequently asked questions

What does Craif do?
Craif develops biomarker analysis and AI-driven diagnostic solutions to enable early disease detection and personalized treatment through non-invasive testing of body fluids.
Who founded Craif?
Craif was founded by Ryuichi Onose in 2018.
Who are Craif's investors?
Craif's investors include 1955 Capital, Global Brain, Saisei Ventures, Aozora Corporate Investment, Dreamers VC.
How much funding has Craif raised?
Craif has disclosed $11.3M raised across 1 of its 3 known rounds.
Where is Craif headquartered?
Craif is headquartered in Tokyo, JP.