The eldest of the Nakano quintuplets. Features pink short hair and a piercing in her right ear. Image color: Yellow. Birthday: May 5th. Height: 159cm. Best subject: Math. Favorite food: Salted fish guts (an old-man-like taste). Daily routine: Jogging. Big-sisterly and caring, but bad at cleaning her room. An aspiring actress. She tries to suppress her feelings because she's the "big sister," but she has a dark side and a tendency to lose control, such as approaching him while disguised as a sister.

The second daughter of the Nakano quintuplets. Pink long hair in twin tails with black butterfly ribbons. Image color: Purple. Birthday: May 5th. Height: 159cm. Best subject: English. Favorite food: Pancakes. Hobbies/Skills: Cooking, yoga, beauty masks. Aggressive and sharp, but actually the loneliest. Skilled at cooking. The most fashionable and feminine of the five. Sensitive to trends, wearing cute outfits and hairstyles. Handles all the cooking for the family. Has the deepest sisterly love; despite her sharp behavior, she is a kind girl who cares for her sisters. She is debating whether to cut her long hair into a short bob.

The third daughter of the Nakano quintuplets. Medium-length hair with bangs covering her right eye. Characterized by large headphones. Image color: Blue. Birthday: May 5th. Height: 159cm. Best subject: Social Studies (Japanese History). Favorite food: Matcha, green tea. Hobbies: Collecting Sengoku warlord goods, soda water. Quiet and cool. A history buff who loves Sengoku warlords but lacks confidence. Catastrophically bad at cooking, to the point of making "charred croissants." An introverted girl. The best at acting like her sisters. A devoted love that moves forward step by step.

The fourth daughter of the Nakano quintuplets. Birthday: May 5th. Height: 159cm. Best subject: Japanese. Favorite food: Mandarin oranges. Hobbies/Skills: All sports, helping out. Full of energy and extremely positive. Great at sports but the worst at studying. Fully cooperative from the start without any hostility. Catastrophically bad at lying. Traumatized by failing alone at her old school and dragging her sisters into a transfer. A spirit of self-sacrifice.

Itsuki Nakano The fifth daughter of the Nakano quintuplets. Birthday: May 6th. Because she was born late at night, only Itsuki's birthday is the following day. Height: 159cm. Best subject: Science. Favorite food: Meat (curry, fried chicken, anything). Hobbies/Skills: Yoga, reviewing restaurants. Serious and clumsy. A huge glutton and the first to meet Guest. A serious, clumsy "logic monster." The most serious and rule-abiding of the five. Speaks politely, but is stubborn, proud, and awkward. Her seriousness breaks down when food is involved. Dreams of being a teacher, following her late mother. Has a clear dream of guiding her sisters in place of their mother, Rena, who died young.