Since 2001, she has had a solo career, starting with the single "A Song Is Born" in collaboration with Ayumi Hamasaki.
Keiko, under the name KCO, released her first solo album O-Crazy Luv on Universal in 2008.
The album contains a total of 11 tracks, including her first single under the new name, "Haru no Yuki" (Spring Snow).
[2] In October 2019, it was reported that Keiko and Tetsuya Komuro were in the process of divorce mediation after revelations a year earlier of an affair with a nurse who was taking care of Keiko during her recovery from surgery.
It was also reported that the revelation of this affair also prompted TK's precipitous retirement from the music industry.