Ishida Ayumi, born January 7, 1997 in Miyagi Prefecture, Japan, is a 10th generation member of Morning Musume. Prior to joining Morning Musume, Ishida was an official backup dancer for the Avex Trax girl group Dorothy Little Happy.
Ishida Ayumi was selected from Morning Musume's 10th Generation audition to join the group on September 29, 2011, along with Iikubo Haruna, Satou Masaki, and former Hello! Pro Egg Kudou Haruka.
The tenth generation made their official presentation on the same day they were announced as new members in the "Morning Musume Concert Tour Fall 2011 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".
(Source: Hello! Project Wiki)