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Adachi is part of the Watanabe Entertainment group named D-Boys. As a member of the D-Boys, Adachi also keeps a blog, which he updates occasionally and includes a personal video greeting from Adachi. Being a part of the D-Boys provided Adachi with a lot of opportunities. Among them was to perform with the group of boys and expand his experience as a performer.The D-Boys so far have released two Photobooks. The first photo-book released on April 27, 2005 was self-titled D-Boys, while the second, released on March 15th, 2006 was called Start, both which contain many photos of Adachi.
Adachi has starred in a various number of TV shows. He's also appeared in Glay's "White Road" music video. Adachi was also apart of the Watanabe net drama, Hice Cool (2005), appearing alongside fellow D-Boy members, Yanagi Kotarou, Endou Yuuya, and Yu Shirota.
Adachi won the role of Eiji Kikumaru, the acrobatic 3rd year regular of Seigaku Middle School's tennis club. And from 2005 to 2006, he became the third actor to play Eiji in the The Prince of Tennis Musicals. On March 29th, 2006, in the Dream Live 3rd Live concert, he along with the majority of the Seigaku cast, graduated from their roles. Adachi was able to carry on his role as Eiji Kikumaru from the musicals to the live-adaptation film, Tenisu no Ôjisama (2006), of the anime/manga series, _"Tennis no oujisama" (2001)_. He, along with most of the principle cast members for the Seigaku Regulars, were able to reprise their roles for the movie.
Adachi currently stars as Akira Sakamoto in the live action TV drama based on the anime/manga Princess Princess series entitled, Princess Princess D, which premiered in Japan on June 28th, 2006. He's also starring in the TV drama, My Boss My Hero, as the character, Shinichi Maki.
