Konishi formed a budding interest in stage acting as a junior high student, and as a high schooler, received voice training at the Nihon Narration Engi Kenkyūjo [ja].
She released NOVELETTE (EMI Music Japan, 1999), her first album under her own identity. She teamed up with Ryo Arshe (Ryo Asakawa), her musical collaborator since 1998 and the artist NAOMI, forming the musical unit Little Cure.[citation needed]
As a TV personality, she has appeared on both NHK and public sector network shows. She had been a regular on the TV Tokyo-syndicated variety show Ichioshi Kiss, where she was portrayed as the youngest of three sisters, with co-stars Risa Stegmayer [ja] and Hinako Saeki. She was also narrator for the short-lived "pick of the week" show Ichioshi [ja]. She also acted in live action TV Commercials for "Dial 104" (cellphone directory assistance), as keitai detective PI Hiroko.
In 2018, Konishi claimed that she was replaced as Ojarumaru in Prince Mackaroo from disputes over her voice recording on Ojarumaru dolls and other merchandise.[2] Motivated by the MeToo movement, Konishi shared that she left voice acting after being sexually harassed and witnessing her other female peers abused by their agencies. She also alleged that she was propositioned by her manager Hara to enter a mixed bath in the nude with Akitaro Daichi and claimed that she was unable to get voice acting work after she refused.[3]