Born and raised in Kobe, Japan, Komatsu began her career as a songwriter, writing "Kono Machi de Kimi to Kurashitai" for Field of View.
In May 1997, she released her debut single "Nazo", which served as the theme song to the Japanese anime series Case Closed.
After releasing a compilation album Miho Komatsu Best: Once More (2006), which peaked at number 21 in Japan, she retired from the music industry with no announcement.
As a songwriter, Komatsu has written songs for artists including Field of View, Deen, Wands, Rina Aiuchi, U-ka Saegusa in dB.
She has earned three Oricon Weekly Singles Chart top ten songs as a songwriter with "Kimi ga Inai Natsu" by Deen, "Sabitsuita Machine Gun de Ima o Uchinukō" by Wands, and "Precious Place" by Aiuchi.
Her music career then started by the 8th grade when she began making and writing songs on her own and participated in a band as keyboardist around this time as well.
On 7 April 1997, the on-air version of her debut single Nazo was broadcast as an opening theme for the anime television series Detective Conan.
On 23 April 1997, the band Field of View released single Kono Machi de Kimi to Kurashitai where Miho was credited as a writer.
On 18 June 1997, Miho wrote Japanese singer Arisa Tsujio's debut single Aoi Sora ni Deata.
In the media, it was promoted as a first ending theme for anime television series Chūka Ichiban!, the on-air version broadcast on April 27.
On 5 July 1997, the on-air version of Kagayakeru Hoshi was broadcast on TV Asahi as an ending theme for Anime television series Manmaru The Ninja Penguin.
On 28 August 1997, the band Deen released twelfth single Kimi ga Inai Natsu where Miho was credited as a writer.
The on-air version of the song started to be broadcast on 11 August by Yomiuri TV as an ending theme for Anime television series Detective Conan.
On 3 September 1997, the band Wands released twelfth single Sabitsuita Machine Gun de Ima wo Uchi Nukou and Miho was credited as a writer.
In the media it was broadcast on Fuji TV as an ending theme for Anime television series Dragon Ball GT.
On 8 October 1997, the band Field of View released their first compilation album Singles Collection +4 and in track Oozora he was Miho credited as a writer.
[6] On 8 December 1997, the on-air version of Negai Goto Hitotsu Dake start broadcast on YomiuriTV as an ending theme for Anime television series Detective Conan.
[8] On 18 February 1998, the band Deen released fourteenth single Tooi Sora de and Miho was credited as a writer.
B-side track Ichiman Meter no Keshiki also received three broadcasts promotions, as a theme song for Yomiuri TV program Japan International Birdman Rally, as an ending theme for Shizuoka Asahi Television informational program Sport Paradise and commercial song for Iwaki Meisei University's radio.
On 18 November 1998, the band Deen released sixteenth single Tegotae no nai Ai where Miho was credited as a writer.
[12] In January 1999, the on-air version of Sayonara no Kakera broadcast as an ending theme for TV Asahi program Paku2 Gurumenbo.
In 3 April, the on-air version of Saitan Kyori de broadcast on TBS television program Rank Oukoku as an ending theme.
On 17 April, the on-air version of Kaze ga Soyogu Basho broadcast on TBS Anime television series Monster Rancher as an opening theme.
The album track "Beautiful Life" was promoted on TV Asahi program Yajiuma Wide as an ending theme.
On 24 January 2001, Japanese singer-songwriter Rina Aiuchi released her debut album Be Happy where in track "Her Lament: Dare ni mo Kikoenai Kanojo no Sakebi" Miho was credited as writer for the first time after three years.
On 19 December, two of Miho's singles "Love Gone" and "Todomaru Koto no nai Ai" were included in the compilation album Giza Studio Masterpiece Blend 2001.
On 3 April 2005, the on-air version of I just wanna hold you tight was broadcast on TV Tokyo as an ending theme for Anime television series MÄR.
On 27 July 2005, Japanese singer Sayuri Iwata released second single Fukigen ni Naru Watashi where Miho was credited as a writer.
On 29 March 2006, Japanese singer-songwriter Rina Aiuchi released 26th single Glorious/Precious Place, in Glorious she was credited as a writer for the last time.
In 7 April, 2011, Sai Saida (斉田才), a producer in Giza Studio, confirmed that Komatsu is "very close to her retirement" on his Twitter.