Riyu Kosaka (?? ??(?? ??), Kosaka Riyu?) is a J-pop singer, as well as a member of the Konami-produced J-Pop group BeForU. Kosaka was born in Yokohama, Kanagawa, Japan on January 17, 1985.
On November 20th, 2000, Konami and Toshiba-EMI staff held auditions to form a J-pop group, which would eventually become BeForU. A good many people auditioned, and Kosaka, who was then fifteen years old, was one of four who went on to join the group.
Four years of hard work!This month of May we celebrated four years on the air. We continue working on the dissemination of this wonderful instrument, thank you for participating in our story!