Music by Offshore, Yuya Saito (Sound Drive)
Scoring: Takeshi Iwasaki (F.M.F)
Drums: Mi-cyan (from KISIDA KYODAN & THE AKEBOSI ROCKETS)
Guitar: Yutaka Sekine
Bonus for buying Deep One (JAN: 4995669931214) at Sofmap.
Album was composed by Offshore / Yuya Saito and was released on October 26, 2018. Soundtrack consists of 20 tracks tracks with duration over . Album was released by Nameless.
CD 1
| 1 | bgm_40 DeepOneメインテーマ | | |
| 2 | bgm_01 英国風土 | | |
| 3 | bgm_02 挑戦 | | |
| 4 | bgm_03 勝利を望む者 | | |
| 5 | bgm_05 斎野家の朝 | | |
| 6 | bgm_08 秀盟宮花学園 | | |
| 7 | bgm_10 家路 | | |
| 8 | bgm_11 穏やかな家 | | |
| 9 | bgm_12 不気味な裏路地 | | |
| 10 | bgm_16 涙をこらえて | | |
| 11 | bgm_18 絶対的な危機 | | |
| 12 | bgm_20 奥義解放 | | |
| 13 | bgm_23 異端審問 | | |
| 14 | bgm_25 戦闘激化 | | |
| 15 | bgm_26 泥濘に芽吹く華 | | |
| 16 | bgm_28 壊れた少女 | | |
| 17 | bgm_29 睦 | | |
| 18 | bgm_30 死闘 | | |
| 19 | bgm_37 魔女の横顔 | | |
| 20 | bgm_42 にゃんこマンのテーマ | | |
