All Ken Hirai Songs
| Songs | In album |
|---|---|
| Aish**eru | - |
| Because Of You | - |
| Boku No Kokoro Wo Tsukutteyo * | - |
| Boku Wa Kimi Ni Koi Wo Suru | - |
| Bye My Melody | - |
| Canvas | - |
| Elegy | - |
| Fake Star | - |
| Grotesque * | - |
| Hitomi Wo Tojite | - |
| Itoshiki Hibi Yo | - |
| Kikyogaoka * | - |
| Kiss Of Life | - |
| Lovin' You | - |
| Mahoutte Itte Iikana? * | - |
| Plus One * | - |
| Pop Star | - |
| Rakuen | - |
| Soredemo sh**ai * | - |