M-01
Performer: Masashi Igarashi, Yusuke Shirai
Composer: Yu
Arranger: Yu
Strings Arranger: Yuki Nara
Lyricist: Yu
M-02
Performer: Harugumi (Koutaro Nishiyama, Kodai Sakai, Masashi Igarashi, Yusuke Shirai, Shintaro Asanuma)
Composer: Masayoshi Oishi
Arranger: Masayoshi Oishi, Yuki Nara
Lyricist: Masayoshi Oishi
M-03
Cast: Kodai Sakai, Yusuke Shirai, Koutaro Nishiyama, Shintaro Asanuma, Masashi Igarashi, Wataru Hatano, Kouichi Souma, Akinori Egoshi
Album was composed by Masayoshi Oishi / YU and was released on June 26, 2019. Soundtrack consists of 5 tracks tracks with duration over about 25 minutes. Album was released by Pony Canyon.
CD 1
| 1 | はじまりはカルテット | 03:54 | |
| 2 | Ever☆Blooming! ～春組Ver.～ | 03:54 | |
| 3 | 『A3!』ボイスドラマ 「MANKAIチャンネル ～春組編～」 | 10:20 | |
| 4 | はじまりはカルテット (INSTRUMENTAL) | 03:53 | |
| 5 | Ever☆Blooming! (INSTRUMENTAL) | 03:50 | |
