The most popular of which being ‘Nobuta Wo Produce’ (2005) during which was formed the temporary duo Shūji to Akira with him and Yamashita Tomohisa singing the theme song 'Seishun Amigo'.The single was a massive success and broke one million sales in 2005.
Most notably 'Gokusen 2' (2005) with Akanashi Jin and 'Tatta Hitotsu no Koi' (2006) with Tanaka Koki.
Both Akanashi and Tanaka have now left KAT-TUN, Akanashi in 2010 and Tanaka in 2013.
Another popular drama he starred in 'Yokai Ningen Bem' (2011) was also adapted into a film in 2012.
As a departure from TV spin offs Kamenashi starred in the bizarre comedy, thriller ‘Ore, Ore’.
In 2002 he and five others formed the Johnny’s Juniors group KAT-TUN who are still active to this day.
He has starred in dramas and movies fairly consistently since 2005.I can't wait for his P&JK movie it looks promising! He's supposed to be the most handsome boy in the drama but he is not." I was like that for the first 10 minutes. I've watched all of his dramas not just once or twice but several times already and still watching them.and I ship him with Tao Tsuchiya despite being young she seem to have the best chemistry with him out of all his female co-stars basing on the trailer ! But after that i already admitted to myself that he is the most beautiful guy i had ever laid my eyes on. Right now i'm watching tokyo bandwagon and yamanade. I am proud to say that i am one of those who love and adore him. I admire the fact that he portrays characters who face conflicts within themselves. He works hard and he loves to work (he's a workaholic) which makes my heart goes doki doki (heartbeats) even more. They're Beautiful...' says i wish you would tour not just in Australia but have a mega tour worldwide.....Also, as a known baseball fan he also is a reporter/MC on the weekly sports and news show ‘Going!’, MC on the monthly show ‘Kamenashi Kazuya no Sports Tengoku Ouen Sukininaru’, and commentator on ‘Dramatic Game’.KAT-TUN's Kazuya Kamenashi and actress Kyoko Fukada attended the press conference for their upcoming TV Asahi Winter 2015 drama, "Second Love". The drama follows the story of 'Kei Taira' (Kamenashi), a skilled dancer who later met and fell into a relationship with senior high teacher, 'Yui Nishihara' (Fukada).