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Born on January 4, 2006. Siero is a rapper and artist from Tokyo, Japan. He began his music career on his 17th birthday. With an unpredictable and distinctive flow, alongside lyrics that strip impulses and inner conflicts down to their raw essence, he quickly emerged as a unique presence within the scene. In 2024, he released THE GOAT TAPE 3. The following year saw the release of Not In Streets, further refining and solidifying his artistic identity. In the same year, he also collaborated with jellyy on the joint EP DON'T PLAY WITH US, accelerating his momentum while continuously evolving through each project and entering new creative phases. On December 24, 2025, he released his album THE GOAT TAPE 4. Arriving at the end of his teenage years, the project encapsulates the experiences and turning points that shaped his journey, while serving as a definitive snapshot of Siero in his current form. In February 2026, Siero held his first-ever solo concert at CIRCUS Tokyo. Tickets sold out immediately. In April 2026, he was selected as a New Comer performer for POP YOURS 2026. Alongside Kianna, HARKA, and AOTO, he also released the POP YOURS original track Starlight. Although his set at the festival lasted only five minutes, his commanding performance left a lasting impression, even trending across social media. Continuing to push his evolution forward, Siero remains on a rapid ascent as one of the most exciting emerging artists of his generation.