U-Ken!
Discography
| Date | Catalog | Name | Roles |
| 2006-08-09 | GNCA-7907 | Muteki na smile / Naozumi Takahashi無敵なsmile / 高橋直純Muteki na smile / Naozumi Takahashi |
|
| 2006-10-25 | HMCH-2001 | Ashita no Kioku / Naozumi Takahashi明日の記憶 / 高橋直純Ashita no Kioku / Naozumi Takahashi |
|