Her debut album, These Words, was released independently in the United States in early 2000 and was sung entirely in English.

[1] After returning to Japan in 2003, Aki followed this with a Japanese-language extended play, One, released under Virgo Music in 2005.

[5] Her debut album, Home (2006), was certified double platinum by the Recording Industry Association of Japan.

[6] Her most commercially successful singles were released between 2006 and 2008: "This Love" (2006), which was used as an ending theme song for the anime Blood+, "Sakurairo" (2007), and "Tegami (Haikei Jūgo no Kimi e)" (2008), which was the compulsory song learnt by junior high choirs for the 2008 Nationwide Contest of Music sponsored by NHK.

[11][12] For the fifth anniversary since her major-label debut single "Home", Aki released White (2011), an album composed of a mix of new songs, re-recordings, and covers.