Hello, Happy World! are Kokoro Tsurumaki (CAST: Miku Ito), Kaoru Seta (CAST: Azusa Tadokoro), Hagumi Kitazawa (CAST: Yuuri Yoshida), Kanon Matsubara (CAST: Moe Toyota), Michelle (CAST: Tomoyo Kurosawa)
Album was composed by Yuta Kasai and was released on February 20, 2019. Soundtrack consists of 4 tracks tracks with duration over about 20 minutes. Album was released by Bushiroad Music.
CD 1
| 1 | High Five ∞ Adventure | 04:31 | |
| 2 | Fuwafuwa ☆ Yumeiro Sandwich | 04:52 | |
| 3 | High Five ∞ Adventure -instrumental- | 04:31 | |
| 4 | Fuwafuwa ☆ Yumeiro Sandwich -instrumental- | 04:50 | |
