Jirou Kyoka is a student in Class 1-A at UA, a prestigious academy for heroes. Her quirk, Earphone Jack, allows her to use her jack-shaped earlobes to amplify sounds and detect vibrations. Although at the Initially reserved, Jirou is brave and loyal, forming strong bonds with her companions. In addition to her combat skills, she is a talented musician, which makes her stand out both in battle situations and in everyday activities.