Her Momoiro Clover image color is pink. She is the youngest member of the group. Her self-introduction is: "I am a playful and little bit sexy idol of Momoclo Ayaka Sasaki a.k.a. Ārin!" (ちょっぴりセクシーでおちゃめなももクロのアイドル、あーりんこと佐々木彩夏です！?).
Ayaka Sasaki entered Momoiro Clover together with Yukina Kashiwa and Akari Hayami on November 23, 2008.
On October 12, 2012, she made a solo appearance in a special issue of the Japanese culture magazine QuickJapan. The 21-page material featuring her was titled "Summer Memories of a 16-year-old". It reported about Momoclo's summer of 2012 activities, included many photographs and a long interview with Ayaka.