: Despite the external criticism and the "sexploitation" narratives often surrounding child idols, Rei has stated she does not view herself as a victim and remains unashamed of her past work. The LADYBABY Breakthrough and Viral Fame

Rei began her career at the incredibly young age of eight, debuting as a junior idol in 2008. During this time, she worked extensively as a gravure model and performer under the agency .

The Evolution of Rei Kuromiya: From Junior Idol to Rock Rebel

However, the pressure of maintaining the idol image took a toll. In November 2017, Rei abruptly left the group—then known as —citing disillusionment with idol culture and severe throat issues.

: Looking back on this period, Rei has described feeling like a "robot" who had to suppress her emotions to meet the demands of the industry.

In 2015, at age 14, Rei joined alongside Rie Kaneko and the cross-dressing Australian wrestler Ladybeard. The group's single "Nippon Manju" became a global viral hit, blending "kawaii" aesthetics with heavy metal.

Rei Kuromiya (born November 29, 2000) has carved out a unique and often controversial path in the Japanese entertainment industry. While she gained global fame as a founding member of the viral sensation , her roots lie deep in the subculture of "junior idols"—a period of her life that was as prolific as it was challenging. The Junior Idol Era (2008–2014)

: Her early years were marked by a high volume of gravure photo sets and DVDs, often marketed toward a niche audience under the "U-15" (under 15) category.