Yu established and became the CEO of eureka in 2008. First launched crowdsourcing platform "MILLION DESIGNS" and sold to LANCERS, Inc. in 2011. Present service portfolio includes "pairs", an online dating service launched in 2012 and "Couples", a communication app for couples launched in 2014. In 2015, acquired by IAC (InterActiveCorp), a NASDAQ-listed company. Besides serving as the Executive Advisor at eureka, Yu advises and supports startups both inside and outside Japan as an angel investor.