Yuki Koyanagi (小柳 ゆき, Koyanagi Yuki?, born January 26, 1982 in Saitama, Saitama Prefecture, Japan), is a Japanese pop singer. Her height is 154cm, and her blood type is 'B'. She released her first single, 'Anata no kisu o kazoemashô - You Were Mine' on September 15, 1999. This song was a huge hit in Japan and made the 17-year-old a sensation overnight. Her second album 'EXPANSION', sold over 1.3 million copies. She has done several albums (in English) of cover songs, including disco and movie standards. After a break of several years, her latest album 'Sunrise' was released in March 2007.

Also, one of her songs "Cross Colors" was featured on the game Shinsangokumusou 4.

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