Songs
- OyasuminasaiKen Hirai
- Half of MeKen Hirai
- OnininarimashitaKen Hirai
- ItemotattemoKen Hirai
- Poliesuteru No OnnaKen Hirai
- orthodoxKen Hirai
- #302Ken Hirai
- KAIBUTSUSANKen Hirai feat.AIMYON
- 1995Ken Hirai
- Fake Star Ken's Swingin' JazzKen Hirai
- Kimino Sukinakoto [Less Vocal]Ken Hirai
- UtsukushiihitoKen Hirai
- Pop StarKen Hirai
- UtaKen Hirai
- Negative BoyKen Hirai
- GiftKen Hirai
- Emmm...Ken Hirai
- Don't Kan Don't KoiKen Hirai
- Ichiban Hajimeteno KoibitoKen Hirai
- YatterannaizeKen Hirai
- Dance with YouKen Hirai
- BlanketKen Hirai
- Ready for Your LoveKen Hirai
- NonfictionKen Hirai
- Bokunokokorowo TsukutteyoKen Hirai
- Mahoutte Itte Iikana?Ken Hirai
- TimeKen Hirai
- Plus OneKen Hirai
- OnnajisamishisaKen Hirai
- SoredemoshitaiKen Hirai