!, where he was selected as one of the members for the boy band Run&Gun,[2] later debuting on July 4, 2001 with the single "Lay-Up!
"[3] During his time with the group, in 2005, Kamiyama also released a solo song titled "Byū Byū Kuru Yasashisa wa" for Run&Gun's first extended play, Hateshinai Tabi no Naka de...[4] In 2007, Kamiyama was cast as Romeo in the stage play adaptation of Air Gear.
[5] In the second installment he took over the lead role of Minami Ikki after Kenta Kamakari fell ill.[citation needed] He broke his arm during the second-to-last showing of the musical; however, he continued performing.
[citation needed] In addition to this, Kamiyama also published his first novel, Flying Melon, which was co-written with Kosuke Yonehara.
[2] In 2009, Kamiyama starred in the all-male stage adaptation of Fruits Basket as Kyo Soma.