[6] On June 8 2021, Yanagimachi was named to the starting lineup for the first time in the interleague play against the Hiroshima Toyo Carp and recorded two hits.

March 31, 2022, Ryoya Kurihara injured his left knee, so he was placed on the first team registration and had a multi-hit game that day against the Chiba Lotte Marines.

[12] He returned on June 17 and scored a run on a two-base hit against the Tohoku Rakuten Golden Eagles.

In 2023 season,Yanagimachi became a regular left fielder by recording three RBIs, tied for the most in his career, in the interleague play against the Chunichi Dragons on June 1.

[15] He also scored the winning hit against the Hokkaido Nippon-Ham Fighters on September 18, ending his team's losing streak.