The single was announced on January 15, 2021, during STU48's first Nippon Budokan concert, followed by the first live performance of the title song.

[2] The music video is the first one from STU48 to heavily utilize computer graphics along with outdoor scenes filmed on Kamikamagari Island in Kure, Hiroshima,[3] in contrast to the group's usual full location shootings at Setouchi region points of interest, due to the COVID-19 pandemic.

The choreography was created by Tomohiko Tsujimoto, who has choreographed several STU48 songs and envisioned a fantasy-like atmosphere for this music video, in which the performers meet their "alternate selves".

[3][4] "Hitorigoto de Kataru Kurainara" became the theme song for the 2021 animated short film Santa Company: Midsummer Merry Christmas (サンタ・カンパニー 〜真夏のメリークリスマス〜, Santa Kanpanī ~Manatsu no Merī Kurisumasu~), which was part of a Nippon Foundation campaign to raise awareness about marine debris.

[7][8] The Setouchi PR Unit, which members were elected using ballots included with the previous single, performed "Boku wa Kono Umi o Nagameteru" (僕はこの海を眺めてる, lit.