Johnny's Jr.
Nakajima joined Johnny's Jr. on March 28, 2004, in his 5th year of elementary school. After joining Johnny's Jr., he began performing together with J.J.Express as one of the five original members along with Kouhei Matsumoto, Takumi Yamashita, Yuta Tamamori, and current Hey! Say! JUMP member, Kei Inoo.