Riyu Kosaka (小坂 りゆ（小坂 梨由）, Kosaka Riyu, born January 17, 1985) is a Japanese pop singer and lyricist. She is best known as a member of the Konami-produced Japanese teen pop girl group BeForU.
Riyu Kosaka (小坂 りゆ（小坂 梨由）, Kosaka Riyu, born January 17, 1985) is a Japanese pop singer and lyricist. She is best known as a member of the Konami-produced Japanese teen pop girl group BeForU.