Tập 1: Guita trưởng nhút nhát Hitori Gotou tham gia Kessoku Band với vai trò hỗ trợ guitar trong một ngày.

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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)