Tanaka Yusuke is a developper specializing in Game, Programming, Utility, Graphics, Database, and Internet in Japan. I developed card-type database for Windows as a university student and it was a tremendous success. On this occasion, I founded "TNKa", which was the forerunner of the present TNK software. Thereafter, regardless of genres, many variegation of personal computer software such as utilities and games, etc. has been released. "TNKa" changed name to "TNK software" in 2003 and it arrives up to the present time.