In 2015, Rei co-founded the viral idol group alongside Rie Kaneko and Australian wrestler Ladybeard .
Their music expresses the bold, loud sound of ↓↓↓ BRATS is the Japanese rock band formed by sisters Rei Kuromiya and Aya Kuromiya. YouTube · BRATS
Rei Kuromiya debuted in under the agency Charm Pro. As a junior idol, her early work focused on gravure (modeling) and teen-pop musical projects, often alongside her older sister, Aya. During this period, she released media such as:
Rei Kuromiya's remarkable journey as a junior idol offers valuable insights into the world of Japanese pop culture. Her dedication, talent, and adaptability have enabled her to thrive in a highly competitive industry, earning her a loyal fanbase and critical acclaim. As the entertainment landscape continues to shift, Rei remains a beacon of inspiration for aspiring performers and a testament to the enduring appeal of junior idols.