He is popularly known as "the Dragon of Dojima" ( 堂島の龍, Dōjima no Ryū) due to the tattoo of a dragon on his back and him originally being a fearsome member of the yakuza group known as the Dojima Family, a subsidiary of the Tojo Clan.
Kazunari Ninomiya se narodil v Tokiu v roce 1983. V roce 1999 debutoval singlem Arashi od stejnojmenné skupiny. Z písně se stal hit a prodalo se jej několik miliónů kusů.