Haru Kagurano is a high school student and the daughter of Saitama University's Professor Kaihou Kagurano. She possesses blonde hair and violet eyes, typically dressed in casual or school attire featuring a white shirt, plaid skirt, and red necktie, sometimes adding a star hair ornament. Her passions are fashion, socializing, and bubble tea—especially from Tapioca World and its mascot Tapio-kun—while she actively avoids academic work. Haru bounces through life with a carefree, gyaru-like energy, speaking informally and affectionately calling her tutor Shinya Yukimura "Yukipii." Her aversion to studying stems from her father's relentless criticism; he constantly belittled her intelligence while comparing her unfavorably to an academically successful older sister. This eroded her self-worth, leading her to accept the label "stupid" and abandon her studies, prioritizing fashion, snacks, and fun. Her path shifts when her father hires Yukimura as her private tutor to boost her grades for university admission. Though resistant, Yukimura spots her potential and tailors lessons to her empathetic nature. A crucial moment arrives as Haru overhears Yukimura confronting her father about the harm caused by his constant negativity. Yukimura insists Haru's struggles stem from environment, not lack of ability, forcing her father to reconsider her potential. This revelation profoundly alters her self-view. Spurred by this and Yukimura's guidance, Haru slowly commits to her studies. Her growing confidence receives another boost during the Saitama University festival, where Ayame Himuro shows her around campus. This exposure to university life, fueled by her newfound academic focus, culminates in her successful enrollment at Saitama University.