In 1998 he co-founded Onsale, a company which later became GungHo. He then managed the company as CEO and it went public on Nippon New Market Hercules (which later became JASDAQ) on March 9, 2005. The company’s market value in 2013 was $10.4 billion due to its Gaming mobile app Puzzle & Dragons which was the top revenue earning app globally for the year.
In 2009 he founded a seed stage accelerator MOVIDA JAPAN which supported 47 startups. Some of those startups are translimit, flier, trippiece, nana music, U-NOTE, and Shiroyagi Corporation. The company finished offering its seed acceleration program in June 2014. The investment function has been separated into a venture capital fund Genuine Startups.
In 2013 he founded Mistletoe, a hub for startups and the overall entrepreneurial ecosystem. With the company he and his members provide learning opportunities for entrepreneurs, facilitate startup communities, invest in and support startup companies and venture capitals.