Kaoru Hoshino is a preparatory student in Kouka School of Musical and Theatrical Arts' Centennial Class, alongside Sarasa Watanabe and Ai Narata. Born into a family deeply connected to the Kouka Revue—her grandmother and mother both performed as actresses—she carries the weight of this legacy, earning her the "thoroughbred" designation within the Kouka community. Kaoru passed the academy's entrance exam in her third year of high school, her final year of eligibility. Her primary ambition is to master otokoyaku roles, specializing in male characters within the all-female tradition. Standing approximately 171 cm tall, she possesses honey-blonde hair and eyes, her slightly wavy shoulder-length hair featuring bangs swept to the right. During her training, her appearance evolves significantly as she adopts a short pixie cut to better embody otokoyaku characters. Professionally dedicated and hardworking, Kaoru's strong-minded nature sometimes sparks conflicts with peers or instructors. A pivotal moment in Episode 8 highlights her artistic progression: a scene at a bus shelter emphasizes the significance of hand and arm gestures as she removes her gloves. This episode also features her performing the song "薔薇と私" (Bara To Watashi), reflecting her role. Her given name "Kaoru" means "fragrance" or "fragrant," while her surname "Hoshino" combines "star" (星, hoshi) and "field" or "wilderness" (野, no).