She is the daughter of an African-American father and Korean mother, born and raised in Yokohama, Kanagawa Prefecture, Japan. Her best-selling single in her career so far is 2005's "Koi ni Ochitara" which was used in the drama Koi ni Ochitara: Boku no Seikou no Himitsu.

Real name: Crystal Kai Williams

(Source: Wikipedia)