Naru Hakobe is the energetic bassist and core member of the band Irodorimidori. Fifteen years old and Serina's younger cousin, she sports long black hair in twintails tied with blue ribbons, red eyes, and a notably short stature. Her school uniform features a sailor dress with a blue ribbon tie, blue-striped kneesocks, and short black boots revealing blue inner lining folded at the top. These blue accents signify her first-year status initially and second-year later on. She wields a Jet Black YAMAHA RBX4A2 bass guitar customized with white decals of an arrow and concentric circles, using a plain black strap and pick.

Personality-wise, Naru radiates rebellion, rejecting conventional norms with vibrant energy. She champions individuality and absurdity, declaring "It's way more fun to make no sense!" and viewing rigid correctness as antithetical to rock 'n' roll. Emphatically an outsider, she states "My rock isn't the usual cookie-cutter stuff, I go my own way!" and embraces rockstar behavior. She actively engages in all band activities, including rehearsals, sleepovers, and performances aimed at securing top placement at the Maigahara Senior High festival for rumored extra credit.

Naru joined Irodorimidori at its founding in Chapter 1 and remains a permanent member. She contributes vocals to songs such as the solos "DETARAME ROCK&ROLL THEORY" and "Nekomatsuri," and collaborations like "Day by Day CRiSiS Songs" with Aliciana and "MAIGAHARA Punchline Kickers" with Minae. Her character appears throughout the anime series, including a scene in Episode 3 where she is depicted bathing while on the phone.