In this musical adaptation of the anime, Kawagoe Boys Sing, an eccentric ex-conductor helps a unique group of high school students form a boys choir, where they learn to express themselves and overcome their fears.
| Actor | Role |
|---|---|
 Toshiyuki SomeyaHaruo Hibiki (響春男) | Haruo Hibiki (響春男) |
 Hikaru ImamakiTenshi Dei (出井天使) / Danbocchi | Tenshi Dei (出井天使) / Danbocchi |
 Yusuke TakemotoHiroshi Yazawa (矢沢ひろし) / Ei-chan | Hiroshi Yazawa (矢沢ひろし) / Ei-chan |
 Sho KatoShuji Shiratori (白鳥修治) / Tori-chan | Shuji Shiratori (白鳥修治) / Tori-chan |
 Kazan YokoyamaKaito Kobashi (小橋快人) / IT-kun | Kaito Kobashi (小橋快人) / IT-kun |
 Haruto SakurabaShizuo Barato (茨戸静男) / Otome | Shizuo Barato (茨戸静男) / Otome |
| AAkito TeshimaJin Adachi (足立尽) | Jin Adachi (足立尽) |
 Ikumi IsakaKō Hyūga (日向行) | Kō Hyūga (日向行) |
| TToaru IsonoShin Hyūga (日向進) | Shin Hyūga (日向進) |
| RRen TakanshiTomo Hakase (葉加瀬友) / Hakase | Tomo Hakase (葉加瀬友) / Hakase |
 Joel ShoheiCurtis Suzuki (鈴木カーティス) / Magic | Curtis Suzuki (鈴木カーティス) / Magic |
| YYuta KashizawaMichiru Morimura (森村充) | Michiru Morimura (森村充) |
| YYamato KikutaEnsemble | Ensemble |
| 小小山麗也Ensemble | Ensemble |
| TTaro TakamotoEnsemble | Ensemble |
| RRyo NarumiEnsemble | Ensemble |
| YYohei HosokawaEnsemble | Ensemble |
| KKento YonezawaEnsemble | Ensemble |