原作を膨らませつつもほぼそのままなぞっており、原作単行本2巻途中にある、文化祭ライブとその後のひとりの新ギター購入までを描いている。
Hitori "Bocchi-chan" ("Loner") Gotō is a lonely high school girl whose heart lies in her guitar. She does nothing every day except strum her guitar by herself at home. However, she happens one day to meet Nijika Ijichi, who is looking for a guitarist for her group named "Kessoku Band."