Ishida Ayumi was selected from Morning Musume's 10th Generation audition to join the group on September 29, 2011, along with Iikubo Haruna, Sato Masaki, 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". In the final concert, they also participated in "Tomo" and the end of "Namidacchi".
On April 18 2012, it was announced that Morning Musume's Tanaka Reina and the 9th and 10th Generation members will participate in a new stage play titled Stacey’s Shoujo Saisatsu Kageki.