In 2006, Yanagishita won the Watanabe Entertainment´s 3rd official D-BOYS audition with the Grand Prix and became an official member of the group. In Winter of the same year, Yanagishita won the role of Kaoru Kaidoh, the viper-like 2nd year regular of Seigaku Middle School's tennis club, in the Prince of Tennis musical series, Tenimyu, as part of the third generation Seigaku cast. Prior to his casting, Kousuke Kujirai, who had played the role before him with the second Seigaku cast, had filled in as Kaidoh with the third cast due to actor Takahiro Tasaki's withdrawal from the show. Yanagishita debuted as Kaidoh in the Absolute King Rikkai feat. Rokkaku ~ First Service musical on December 13, 2006.