Kaori Maejima is a third-year piano student at Shukusei Music Academy and the chairman's granddaughter, a connection she wields to assert status and influence. Her background fuels a haughty, arrogant personality; she openly values "money and power" and maintains a superior attitude. Physically, she has blonde wavy hair often styled with sidehair, green eyes, a pale complexion, stands 158 cm tall, and has measurements of 84-58-88 cm. She favors mature clothing like pleated skirts and school uniforms, reflecting her elite self-image. Residing in the academy dormitory among musically talented peers, Kaori has a strained relationship with instructor Minami Ayaka. She dismissively refers to dormitory manager Shusaku as "Katou," indicating a confrontational dynamic. Kaori is explicitly not naive or inexperienced; sources state she is "not a virgin" and subject to exploitation, including being drugged as part of Shusaku's blackmail schemes. Within the narrative, Kaori forms an alliance with another student, Eri Takabe, to oppose Shusaku's predatory actions targeting dormitory residents. This collaboration places her in direct conflict with her grandfather.