Naruki Doi
Shortly after becoming a member of Blood Generation, Shingo began wrestling for Ring of Honor (ROH) in the United States. He made several ROH appearances before becoming a regular wrestler in ROH in late 2006. He became one half of the ROH World Tag Team Champions alongside Naruki Doi on March 3, 2007, by beating the Briscoe Brothers in Liverpool, England. The two lost the championship back to the Briscoes at "All Star Extravaganza III" on March 30.