The English post title is the apparently band’s own (quite liberal) translation, the original would be “Maru de dame na joshikousei wa BANDOMAN ni natta”, so something along the lines of “A totally useless high school girl became a band member”. Kind of autobiographic maybe? lol
Anyway it’s a fun song and they rock out.
Oh yeah, I forgot to mention that the music video features SHELTER, the Shimokitazawa live house which gained fame as the IRL inspiration for Bocchi the Rock’s STARRY.