Born on February 3, 1977, in the Aichi Prefecture (Japan), Aco is a female Japanese singer. She made her debut in 1995 with the pop single "Fuan nano" ( 不安なの). Her debut album 'Kittenish Love' was released in 1996. She explores different musical styles, with the albums 'Absolute Ego' (1999) and 'Material' (2001) displaying Electronica influences. 'The Other Side of Absolute Ego' (2000) was a remix album with remixes by Tricky, DJ Krush, and Silent Poets. 'Material' featured a cover version of This Woman's Work. The track also appeared on the CD-single of another album track '4月のヒーロー'.
In 2003, after a two-year hiatus, she enlisted the help of the avant-garde audio-visual performance group portable [k]ommunity for her quieter, more delicate album, 'Irony'. The album was called "one of the most beautiful albums to come out of Japan in 2003" with the music compared to an "airy lullaby".
She then moved to Germany and made an album that sounded similar to the previous one, 'Irony', but it remained unreleased. Moving back to Japan after a year, she made the mini-album 'Mask', produced by Dragon Ash, Yoshinori Sunahara and Aoki Takamasa. Several albums follow, with success mainly limited to Japan.