kamenashi kazuya's most epic solo is 1582  kamenashi kazuya is the unofficial leader of kat-tun
a japanese idol, singer–songwriter, actor, television personality, producer, radio host and occasional model
"kamenashi kazuya's most epic solo is 1582  kamenashi kazuya is the unofficial leader of kat-tun" What is the definition of "kamenashi kazuya"?