In 1998, she won the 21st Japan Academy Award for Best Music Award in the movie
Tokyo Biyori. She sung the theme song for the Japanese dub of
Kirikou and the Sorceress, "Hadaka no Kiriku". From October 5, 2005, she served as Wednesday navigator (DJ) of the program "Night Stories / The Universe" of FM radio station
J-WAVE in Tokyo. On November 2, 2006, the soundtrack for the Game Boy Advance game
Mother 3 was released, featuring the song "We miss you ~ The theme of love ~", which Onuki sang. She also sang the theme song for
Animal Crossing: The Movie based on
Nintendo's
Animal Crossing video game series. In 2009, Onuki covered
Eiichi Ohtaki's song "Kimi wa Tennen Shoku" for the album
A Long Vacation. In 2020, the movie
Words Bubble Up Like Soda Pop was released, for which Onuki sang the insert song "Yamazakura". On March 11, 2022, Onuki participated in the
Shuichi "Ponta" Murakami tribute concert "One Last Live", performing "Tokai" and "Mon doux Soleil". On February 7, 2026, She performed live at
The Wiltern in Los Angeles – the first time in her career to perform outside of Japan. == Discography ==