High school student Hitori "Bocchi" Gotou has no social life or friends—unless you count her guitar. She dreams of forming a school band, hoping that playing her instrument will improve her social standing. However, despite spending the past two years practicing guitar diligently, she is no closer to achieving her goal. Although she has gained an online following for her guitar covers of popular songs, Bocchi's lack of social skills means her dream may ultimately be impossible. But one day, drummer Nijika Ijichi spots Bocchi alone in a park with her guitar. Desperately in need of a guitarist, Nijika quickly recruits Bocchi into Kessoku Band, which Nijika has formed with bassist Ryou Yamada. Though overwhelmed and left floundering by the sudden social interaction, Bocchi realizes this may be the start of something bigger.