Takagi Sayuki (高木紗友希) is a Japanese pop singer signed to Hello! Project. She is a member of Hello! Project as a Hello! Pro Kenshuusei and Juice=Juice member. She was first introduced at the Hello! Project 2009 Shinjin Kouen 11gatsu ~Yokohama Fire!~ concert on November 23, 2009.
On November 23, she was announced at the Hello! Project 2009 Shinjin Kouen 11gatsu ~Yokohama Fire!~ concert alongside Tanabe Nanami to be joining Hello! Pro Egg, a program where young girls recieve vocal and dance lessons in hopes of someday becoming a full idol in Hello! Project.
Takagi participated in the movie Gekijouban Hontou ni Atta Kowai Hanashi 3D, appearing in The Third Story: "That Someone" alongside Sato Ayano.
She participated in the S/mileage 2nd generation auditions, but failed.
Takagi also participated in the stage play Reborn ~Inochi no Audition~ as Kounotori.
In June, Takagi participated in the Morning Musume 11th Generation ~Suppin Utahime~ Audition, but failed.
Takagi participated in ℃-ute Concert Tour 2012 Winter ~Shinseinaru Pentagram~ as a back-up dancer.
On February 3, during the Bravo! concert in Fukuoka, it was announced that Takagi will debut in a new unit, Juice=Juice, alongside Miyamoto Karin, Kanazawa Tomoko, Miyazaki Yuka, Otsuka Aina, and Uemura Akari.
On February 23, Takagi participated as a back-dancer at Mano Erina's graduation concert.