: In August 2011, at just 10 years old, she formed the rock band BRATS with her older sister, Aya Kuromiya. This project allowed her to explore a darker, more rock-oriented side of her personality that contrasted with the "dreamy" image required of traditional idols.
Rei entered the entertainment industry at the age of 8, working primarily as a junior gravure idol and model. junior idol rei kuromiya work
In later years, Rei has been vocal about the complexities of her start in the industry as a child. : In August 2011, at just 10 years
: She debuted in 2008, initially using the stage name "Ray". By 2009, she joined Bambina Pro , where she quickly became the agency’s most popular talent. In later years, Rei has been vocal about
: While BRATS was a primary focus for many years, the band announced a suspension of activities in March 2024.
: Between 2009 and 2016, she reportedly released over 80 titles, including photo books and DVDs.
As of 2026, Rei Kuromiya has transitioned fully into a professional musician and rock vocalist.