M01
Lyrics: KAB.
Music: Yuichiro Honda
Arrange: Hiromichi Tomioka [富岡ヒロミチ]
Vocal: Kenichi Suzumura, Kisho Taniyama
M02
Lyrics: KAB.
Music: Yuichiro Honda
Arrange: Hiromichi Tomioka
Vocal: Kenichi Suzumura
M03
Lyrics: KAB.
Music: Yuichiro Honda
Arrange: Hiromichi Tomioka
Vocal: Kisho Taniyama
M04, M06
Cast: Kenichi Suzumura, Kisho Taniyama
Album was composed by Yuichiro Honda and was released on January 25, 2006. Soundtrack consists of 6 tracks tracks with duration over about 50 minutes. Album was released by Five Records.
CD 1
| 1 | Keep on smile | 03:38 | |
| 2 | Keep on smile (新野憲吾Ver.) | 03:38 | |
| 3 | Keep on smile (手塚京輔Ver.) | 03:38 | |
| 4 | 二人のプレミアムオーディオドラマ「4月某日(雨)」 | 10:46 | |
| 5 | Keep on smile (カラオケVer.) | 03:38 | |
| 6 | 谷山紀章vs鈴村健一 二人だけのぶっちゃけ座談会! | 23:17 | |
