Episode 93: What Makes a Great Co-Founder in Japan (Part 2) with Ryosuke Murai

Dec 22, 2025
42 mins

Episode Description

In this follow-up to Part 1, we continue our conversation with Ryosuke (Ryo) Murai, CEO and co-founder of AI Market and former CSO of Connected Robotics, where he led a ¥1.7B Series B raise.

This episode is all about how to stand out as a potential co-founder, what really matters during the decision-making process, and how to build a founding team that can last, especially in the Japan startup ecosystem.

Ryo shares his perspective on the co-founder "dating process," how to assess fit beyond just skills, and why 3 co-founders ended up being the right structure for their team.

If you're thinking about starting a company in Japan, or advising someone who is, this is an honest and practical look at how co-founder partnerships are actually formed.

What you’ll learn in this episode:

  • What founders look for when choosing a co-founder

  • How to communicate your vision without overhyping

  • Why startup experience isn’t everything (and what matters more)

  • The emotional and mindset fit behind great co-founder teams

  • Why AI Market chose to bring on a third co-founder

Show Notes:
00:00 – Introduction and recap from Part 1
01:34 – What makes someone stand out as a co-founder
04:50 – Selling your vision and framing your skills
09:00 – Is track record necessary? What else matters?
14:05 – Dating analogy continued: chemistry and red flags
19:50 – Co-founder role clarity and team structure
23:40 – Why 3 co-founders worked better than 2
28:12 – Final thoughts for founders entering the co-founder search


Guest:
Ryosuke (Ryo) Murai – CEO & Co-founder, AI Market
LinkedIn: https://www.linkedin.com/in/ryosukemurai/

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