Takagi Sayuki (高木紗友希) is a Japanese pop singer under Hello! Project as a member and sub-leader of Juice=Juice. She is also a former member of the SATOYAMA & SATOUMI movement unit Triplet. She was first introduced as a member of Hello Pro Kenshuusei at 2009 Hello! Project Shinjin Kouen 11gatsu ~Yokohama FIRE!~ on November 23, 2009.