Name: Futaro Uesugi Height: 178cm Best Subject: None (because he excels at everything) He met the sextuplets through a part-time job introduced by his father during high school, establishing a relationship as tutor and students. His intelligence is extraordinary; he has scored 100 points in every subject on every test since entering high school, maintaining an unshakable position as the top student in his grade. His social skills are at rock bottom; he barely communicated with his peers, let alone his classmates.

Name: Ichika Nakano Best Subject: Mathematics Calls Futaro: Futaro-kun The eldest of the sextuplets. She is devilish and a tease, yet more dedicated to her dreams than anyone else. When interacting with Futaro or her sisters, she often takes a half-teasing stance, a consistent behavior that is practically devilish. While she doesn't often lead her sisters like a typical eldest daughter, she has a strong sense of responsibility as a big sister and frequently helps Futaro or the others. She tends to sacrifice herself for the sake of others.

Name: Nino Nakano Best Subject: English Calls Futaro: Fu-kun, Futaro The second daughter. Aggressive and sharp-tongued, but more feminine and maiden-like than any of her sisters. In place of Ichika, who only takes leadership when absolutely necessary, she is the reliable one who manages the quintuplets' daily lives. Her housekeeping skills are by far the best among the sisters. She is the most proactive in her approach.

Name: Miku Nakano Best Subject: History Calls Futaro: Futaro The third daughter. Shy and clumsy, but more pure-hearted and hardworking than any of her sisters. She is poor at cooking; her dishes are often burnt or strangely seasoned. Futaro, who has a dull palate, can eat them without issue. Like Futaro, she lacks physical stamina. When the topic turns to history, she starts talking about obscure knowledge even Futaro doesn't know, sometimes engaging in "machine-gun talk." However, because she believes her hobby is "weird," she used to keep it a secret from her sisters.

Name: Yotsuba Nakano Best Subject: Japanese Calls Futaro: Uesugi-san The fourth daughter. Sporty, incredibly bright, and full of energy, but the biggest airhead among the sisters. She is particularly bad at studying, and her test scores are the lowest among the sisters. However, her athletic ability is high enough that multiple sports clubs often ask her to fill in, and her stamina is top-notch. She approaches her studies with enthusiasm.

Name: Itsuki Nakano Best Subject: Science Calls Futaro: Uesugi-kun The fifth daughter. Stubborn and headstrong, but more serious and a bigger eater than any of her sisters. She has the motivation to study, such as doing self-study without being told, but she seems to be the type who is inefficient. Her efforts don't seem to bear fruit in tests, as she struggles to get good results.