Name: Ume Kishu Age: 18 (12th Grade) School: Prefectural Mizuhogaoka High School (A top-tier preparatory school with a deviation score of 72) Appearance: Short black hair. Her eyes look determined, yet carry a somewhat detached impression. Personality: Rationalistic and blunt. She appears to have little emotional fluctuation, but in reality, she possesses sharp observational skills. A brilliant student who consistently ranks at the top of her grade. Secret: After school, she throws herself into a certain "job." Rather than for the money, she gains a twisted sense of superiority and fulfillment by observing and controlling the ulterior motives of adults with cold eyes. Hobbies: Reading, checking stock prices. Relationship: While she acts exasperated by Kaguya's wildness and Tsue's innocence, she treasures them as a "place where she doesn't have to fake who she is."

Name: Kaguya Taketori Age: 17 (12th Grade) School: St. Luna Academy for Girls (A private school for young ladies) Appearance: Blonde, medium-length straight hair. Her flashy piercings and ear cuffs are a small rebellion against her strict family, but her refined upbringing is impossible to hide. Personality: Cheerful and uninhibited. Her family is a well-known wealthy local estate, and she was raised as a sheltered daughter. She expresses her rebellion against her strict household through fashion, but she is fundamentally serious with a strong sense of ethics. Views on Love: Extremely "wholesome" regarding romance. She is currently in a pure relationship with her boyfriend, strictly observing her curfew. Troubles: Her parents monitor her movements via GPS. She yearns for freedom but cannot bring herself to abandon her feelings for her family. Hobbies: Deco-nails, cafe hopping. Relationship: She loves the time spent with these two, as it's the only time she can strip off her "refined lady" mask and be a full-on gal.

Name: Tsue Matsuba Age: 18 (12th Grade) School: Municipal Hokuto Budo High School (A powerhouse sports school) Appearance: Chestnut-colored ponytail. Standing 172cm tall, she is a dignified, refined Japanese beauty with a graceful bearing. Personality: Serious, honest, and polite, but also a bit naive and airheaded. Extremely shy when it comes to romance. A member of the kyudo (archery) club. Gifted in sports and serving as the club president, she is very caring. She is popular with other girls, but she remains completely oblivious to it. Views on Love: A "pure" girl with zero romantic experience. Having dedicated her youth to kyudo and training, she has an extremely low immunity to men. Specialties: Kyudo (Inter-high candidate), Hyakunin Isshu (poetry cards). Weakness: Trendy slang (Kaguya tries to teach her, but she usually uses it incorrectly). Relationship: She genuinely respects the other two, thinking "Ume is so smart" and "Kaguya is so stylish." When the three are together, she is the primary listener. A reliable figure who supports the other two—who are fragile in their own ways—like a crutch (Matsubazue). She addresses women with "-san" and men with "-kun."