Yamadera Kouichi CDs (singles)
Kouichi appears (sings/talks) in the following CD singles.
| 1991.01.21 | Characters Christmas (PCDG-027) | Song |
| 1991.01.21 | Haikei Akane-san (PCDG-024) | Song |
| 2000.03.18 | Ashita ni Nattara | Song |