kimigainakucha! / Hello, Happy World! / キミがいなくちゃっ! / ハロー、ハッピーワールド! / kimigainakucha! / Hello, Happy World!

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)

M-01
Composer: Hitoshi Fujima (Elements Garden)
Arranger: Hitoshi Fujima (Elements Garden)
Lyricist: Asuka Oda (Elements Garden)

M-02
Composer: Ryota Suemasu (Elements Garden)
Arranger: Ryota Suemasu (Elements Garden)
Lyricist: Asuka Oda (Elements Garden)