ジャニーズJr.
In 2002, Kazama formed a unit, "4TOPS" with fellow trainees Tomohisa Yamashita, Toma Ikuta, and . The quartet hosted Shounen Club, a Johnny's Jr. variety show. In September 2003, Yamashita was chosen to be a member of a new unit, News. 4TOPS was dissolved with News' debut and the remaining members would focus on acting.