While searching for Nissan GT-R track-testing news, we discovered Corvettes have in fact raced in Japan. The A&S Fields team seems to have run in the smaller-bore GT300 class in Super GT in 2005. In 2003, "Team ZipSpeed" carried the Corvette banner with a C5.
BTW - Here is the link to official Corvette site in Japan. But, a click-through to the "racing news" shows it is only current to C5! Domo arigato, Mr. Roboto, but someone get them the link to badboyvettes.com, ima sugu!