Ayaka Wada joined Hello! Project as a member of Hello! Pro Egg in June 2004 when she passed the auditions alongside thirty-two other girls. The aim of the group was to prepare the young girls for their debut into the world of entertainment, as such Wada recieved free dance and vocal training alongside the other Eggs.
Ayaka continued her training and appeared at numerous Hello! Project concerts as a backing dancer, including the Country Musume concert "Country Musume LIVE2006 ~Shibuya des Date~".
In November 2007 Wada recieved a part in the musical "Reverse! ~Watashi no karada doko desu ka?". Wada also took part in a television show, "Chao.TV" (started 2007/09/02).
She was selected to be one of the four members for a new Hello! Pro Egg unit alongside Maeda Yuuka, Fukuda Kanon and Saho Akari. The group was called Shugo Chara Egg! and was formed to record the opening songs for the anime that Buono! sings for, Shugo Chara!. The group have released two singles to date.
Ayaka Wada, along with Maeda Yuuka, Fukuda Kanon and Ogawa Saki were announced on Tsunku's blog as a new group called S/mileage.
Wada and the rest of S/mileage are going to graduate from Hello! Pro Kenshuusei in the spring concert in 2010. Ayaka and the original Shugo Chara Egg! were in Shugo Chara! the Musical!. She and Saho Akari both played students, X-characters, and X-eggs. Yuuka and Kanon played Amu Hinamori (Yuuka), Nadeshiko Fujisaki (Kanon).
It was announced that Ayaka Wada, Maeda Yuuka, Fukuda Kanon, and Ogawa Saki will graduate into full members in May. Wada, Maeda, and Fukuda became members of a new unit called Lilpri for the anime Hime Chen! Otogi Chikku Idol Lilpri which all three girls voice characters in. Wada is also to be a regular on a nagoya TV show called Go! Bungee Police with Yaguchi Mari.
On July 20, 2012, it was announced that Wada and Sayashi Riho were choosen to form the duo, Peaberry.