Yutaka Tadokoro (田所 豊, Tadokoro Yutaka, born March 12, 1962), known professionally as Diamond Yukai (ダイアモンド✡ユカイ, Daiamondo Yukai), is a Japanese rock singer and actor. He was born in Tanashi, Tokyo, Japan. He is the vocalist for the Japanese rock band Red Warriors. He has acted in the Hollywood films Tokyo Pop and Lost in Translation and is often seen on television variety shows.