Her second album, Expansion, sold over 1.3 million copies, and it features her biggest chart hit, "Aijo".
She is known for singing the English version of "Cross Colors", the ending theme of Dynasty Warriors 4.
[1] Before that, she worked with Nathan Morris and Shawn Stockman of Boyz II Men who wrote most of the songs on and produced her album Intimacy.
[2] Yuki sang the American and Japanese National Anthems during the 2006 World Baseball Classic in Tokyo.
She also sang the Japanese National Anthem for an international soccer match between Japan and Trinidad & Tobago in 2006.