The show follows the students daily lives as they attend a voice acting school.

[3] Koeharu aired on Nippon TV between April 29 and July 1, 2021, and was available on Hulu Japan after its broadcast.

An accompanying talk show was also included on Hulu where Sarina Ushio, the narrator of the series, interviewed other Hinatazaka46 cast members.

[1][4] The opening and closing theme song, "Koe no Ashiato", is included in Hinatazaka46's single "Kimi Shika Katan".

[5] In the storyline, there are also two musical groups who each record a song in the series' soundtrack: "Röntgen Megane" (レントゲン眼鏡) by Maririn & Ruby (Konoka Matsuda and Suzuka Tomita), and "Hell Rose" by Chocola Chocola (Hina Kawata, Hiyori Hamagishi, and Mei Higashimura).