The Drama CDs were created before the anime, and therefore, the voice actor cast is different, except for one. Suzumura Kenichi, anime voice actor for Hitachiin Hikaru, is the only original member who crossed over from the Drama CD cast. For the Drama CDs, he actually played Hitachiin Kaoru instead.
| Character: | Seiyuu: | Other Works: |
| Fujioka Haruhi | Hisakawa Aya | Yoko - 12kokki |
| Suou Tamaki | Midorikawa Hikaru | Sora - Sukina Mono wa Suki Dakara Shouganai |
| Ootori Kyouya | Suwabe Junichi | Sting Oakley - Gundam Seed Destiny |
| Hitachiin Hikaru | Hoshi Souichirou | Kira Yamato - Gundam Seed |
| Hitachiin Kaoru | Suzumura Kenichi | Shinn Asuka - Gundam Seed Destiny Hitachiin Hikaru - Ouran Koukou Host Club |
| Morinozuka Takashi | Tsuda Kenjirou | Inui Sadaharu - Tennis no Oujisama |
| Haninozuka Mitsukuni | Ootani Ikue | Fuji Hime - Harukanaru Toki no Nakade Hachiyousou |