第1話: 臆病なギタリスト、後藤ひとりさんが1日限りのサポートギターとしてKessoku Bandに参加する。

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Hitori Gotou is a girl who is extremely shy and gloomy. She longed for band activities and started playing the guitar, but she couldn't make friends and practiced alone every day. One day, Nijika Ijichi, who plays the drum in a band called "Kessoku Band", asks her to play the support guitar for just one day. (Source: Bocchi the Rock! Fandom-Wiki)