Riyu Kosaka | |
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| Birth name | Riyu Kosaka |
| Also known as | Miki Roberts |
| Born | January 17, 1985 Yokohama, Kanagawa, Japan |
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| Years active | 2000–present |
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| Website | Official website |
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.