Kei Toume studied at the Tama Art University in Tokyo.
Her first manga, Rokujō gekijō, was published in Comic Burger magazine in 1992.
The manga won her the Shiki prize in a contest held by Kodansha in 1993.
This series ran for six years and was adapted into a radio play, an anime and a live action film.
In addition, Toume contributes to a lot of fanzines and specialized magazines, and is also active in video games and films.