Okiayu Ryoutarou CDs (singles)
Ryoutarou appears (sings/talks) in the following CD singles.
| 1995.01.21 | Elles Cinq II: Tiny Heart | Talk |
| 1995.01.21 | Elles Cinq III: Love Drug | Talk |
| 1995.01.21 | Elles Cinq IV: Nostalgic Lover | Talk |
| 1995.01.21 | Elles Cinq V: Tears no Kataomoi | Talk |
| 1997.07.19 | Mountain (COCC-14455) | Song |
| 1997.11.01 | Sotsugyou M voice message Takagi Shimon (CODC-1353) | talk |
| 1998.01.21 | Forever Love [ZMAP] (KIDA-160) | Song |
| 1998.12.01 | Heart ha Koukiatsu [E.M.U.] (CODC-1673) | Song |
| 1999.01.?? | Yuukyuu Gensoukyoku character series 8 (PCDB-016) | Song |
| 1999.05.01 | Sotsugyou M character CD special 1 () | Song |
| 1999.05.01 | Sotsugyou M character CD special 3 () | Song |