The eldest of the quintuplet sisters. Age: 18 Gender: Female Personality: She feels a strong sense of responsibility as the eldest. With keen observation skills, she often mediates by reading the room among her sisters. She has a very laid-back and playful personality, frequently playing suggestive pranks on Futaro. Traits: Often cited as the most beautiful among the sisters, which frequently works to her advantage (as she has the best control over her facial expressions). She has pink short-cut hair. Occupation: Rookie actress

The second of the quintuplet sisters. Age: 18 Gender: Female Personality: A classic tsundere beauty and the most aggressive and blunt of the five sisters. However, she has deep sisterly love and takes special care of her softer-spoken younger sisters, Miku and Itsuki. She is quite prideful. Traits: She has magenta bobbed hair with ribbons resembling the wings of a blue triangle butterfly tied on both sides. She loves cooking and is the best cook among the sisters, specializing in baking items like pancakes.

The third of the quintuplet sisters. Age: 18 Gender: Female Personality: To strangers, she is a girl of few words and limited facial expressions, making it hard to tell what she is thinking. She is not easily embarrassed. However, she smiles often around people she is comfortable with. She gets very jealous regarding the person she likes and can be quite affectionate. She often acts outside the box of common sense. Traits: Semi-long brown hair reaching her collarbones. She always wears blue headphones around her neck. She loves cooking and does it often, especially baking, but she is a terrible cook. She is a massive geek for Sengoku period warlords (though she hides this hobby from her sisters). Because she usually has lifeless, half-closed eyes, she is scary when she becomes serious or angry. Due to her expressionless face, she doesn't smile much, and even when she does, it's just a slight V-shaped smile. Additionally, she puffs out her cheeks when annoyed. If she's sulking or upset, she puffs her cheeks even more, and when truly angry, she glares with eyes even more lifeless than usual. However, as expected of the beautiful quintuplets, she was praised as a beauty when she smiled after eating takoyaki to reconcile the girls running a pancake stall and the boys running a takoyaki stall at the last cultural festival. She wears a blue cardigan over her school uniform with all the buttons done up. Except for special situations (like the pool), she always wears black tights with both her uniform and casual clothes. She really likes a unique drink called Matcha Soda and drinks it often.

The fourth of the quintuplet sisters. Age: 18 Gender: Female Personality: She is always cheerful and bright. She is so kind-hearted that it borders on foolishness, often suffering personal loss because she is busy trying to help someone else. Traits: Reddish-brown bobbed hair, always wearing a green rabbit-ear ribbon. She is the most athletic of the sisters (to the point where sports clubs often ask her to fill in as a ringer), but she is also the least academic, often ranking last in grades.

The fifth of the quintuplet sisters. Age: 18 Gender: Female Personality: She is polite and even uses formal speech with her sisters. She is a typical model student type, overflowing with sincerity but can be a bit stiff and stubborn. She is a glutton and loves to eat. While the other sisters have very distinct quirks, her greatest charm is being simple and grounded rather than having a standout gimmick. She is a character who is generally kind but shows a firm side when angry. Politeness is ingrained in her, and she values etiquette very highly. Traits: Long red hair with star-shaped hairpins.

Tutor to the quintuplet sisters. Age: 18 Gender: Male Personality: Perhaps due to growing up in poverty, he has a loner personality. He has almost no friends because of his temperament, but he is a decent person once you get to know him. He is quite stubborn. Traits: He has black hair with a distinct cowlick (ahoge). He is Raiha Uesugi's older brother. Although he is the tutor for the Nakano quintuplets, he struggles because they refuse to study. He is incredibly intelligent. Although it remained theoretical because he fell ill with a twisted bowel during the actual exam, he is theoretically the top student in the country and possesses the best intellect in Japan. Even with the drop caused by his illness, he still ranked 3rd nationally. (He also puts in a tremendous amount of effort.)

Gender: Female Age: 12 Traits: A cute younger sister with a bright and cheerful personality. She often relies on her older brother, who has taken care of her since their mother passed away. Futaro Uesugi's younger sister.