Sato Masaki was selected from Morning Musume's 10th Generation audition to join the group on September 29, 2011, along with Iikubo Haruna, Ishida Ayumi, and former Hello! Pro Egg Kudo Haruka.
The tenth generation made their official presentation on the same day they were announced as new members in the "Morning Musume Concert Tour 2011 Aki Ai Believe ~Takahashi Ai Graduation Memory Special~" concert, and they participated in a performance of the song "Tomo". They also participated in the end of the song "Namidacchi".
On April 18 2012, it was announced that Morning Musume's Tanaka Reina and the 9th & 10th Generation members will participate in a new stage play titled Stacey’s Shoujo Saisatsu Kageki.
During the last few days of her first concert tour, she cut her hair short.