Sasaki Yuuko is a Japanese pop singer who made her debut in 1997. Sasaki got her start after winning an ASAYAN vocal audition, securing a record deal with Pioneer soon after. In 2000 she became a member of the group Plum Planets, and after the group disbanded in 2003 she disappeared from the music scene. In 2006, Sasaki made a comeback and signed to the label Columbia Records.