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.
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.
He originally began as an assistant to hentai manga artist Dirty Matsumoto, and then as an assistant to manga artist Izumi Matsumoto in the production of Kimagure Orange Road, [1 ] creating his own stories in his spare time.