She is the eldest daughter of actor Takuya Kimura and singer Shizuka Kudo.
She studied under Kanda Hiroaki, a professor at Toho Gakuen School of Music and principal flutist of the NHK Symphony Orchestra.
[1][4] In March 2020, she graduated from Toho Girls' High School, Department of Music.
In April 2020, she started studying in Toho Gakuen School of Music (桐朋学園 音楽部門, Tōhō Gakuen Ongaku Bumon), a private music school in Chōfu, Tokyo, Japan.
[1][5][2] In March 2020, Cocomi debuted as a model, appearing as a cover girl in the May 2020 issue of Vogue Japan.