[4] Starting in 2004, Ariyasu regularly appeared on the Fuji TV network's morning children's program Ponkikkids, where she acted as a member of a unit called Sister Rabbits.

On July 26, 2009, Ariyasu was added as a sixth member to the idol group Momoiro Clover,[10] which was about to release its first indies single.

On November 9, 2012, Ariyasu's video comment was projected at Hige Danshaku's live comedy show at Molière Theater in Shinjuku, Tokyo.

During the performance, Louis Yamada LIII revealed that he was an avid fan of Ariyasu and had even named his recently born daughter Momoka (百夏, a homophone written with different kanji) after her.

On January 15, 2018, Ariyasu announced on her personal blog that she would graduate Momoiro Clover Z to live life without any schedules or plans.

She characterizes herself as "baka" ("silly", "stupid"), saying that at school she cannot understand fundamental things or remember anything, but her co-members say she actually studies all the time, even backstage.