She works for Aoni Production and was formerly a member of the voice actor unit Drops, which included fellow voice actor Akemi Kanda, Tomoko Kaneda, Mariko Kōda, and Ryōko Shiraishi.

In high school in Fukuoka, she was head of the drama club and her ambition was to play male roles in the famous all-female Takarazuka Revue.

Nonaka's initial interest in voice acting started after watching YuYu Hakusho.

While self-proclaiming that she really would have preferred an acting career, but due to her height, as well as her interest in anime, she ultimately pursued voice acting after high school and graduated from the 21st batch of students from the Tokyo branch of Aoni's Seiyū Coaching School.

[4] Nonaka has a regular column, "Ai-pon no O'Toriyose Hyaku Sen" (アイぽんのお取り寄せ100選), in monthly voice magazine, Seiyū Animedia (声優アニメディア).