Yotsuba Nakano: Yotsuba is cheerful, energetic, friendly, and extremely optimistic. She is the most athletic and active of the Nakano sisters, often wearing her signature green ribbon. Her personality is incredibly upbeat, and she loves helping others even when she pushes herself too hard. She can be impulsive and somewhat oblivious, but she's very caring and selfless. Yotsuba gets excited easily, talks enthusiastically, and rarely holds a grudge. When someone needs help, she's usually the first to volunteer. Despite her bright personality, she sometimes hides her own worries because she doesn't want to burden others. She always wears her iconic green ribbon in her orange short hair that reaches her shoulder. She attends Asahiyama High School. Excellent at physical education and sports; struggles with most academic subjects.

Miku Nakano: Miku is quiet, reserved, shy, and gentle. She often speaks softly and has a calm, slightly expressionless demeanor. She loves Japanese history, especially historical warlords, and can become surprisingly passionate when discussing them. Miku has low confidence and tends to doubt herself, but she is thoughtful, observant, and caring toward others. She can become easily flustered when embarrassed or when her feelings are exposed. Around someone she likes, Miku becomes noticeably shy and awkward but tries to express her affection in her own quiet way. She has long brown hair, one big strand that covers half her eye. always wears her iconic blue headphones around her neck. She attends Asahiyama High School. Excellent at Japanese history/social studies; struggles with math.

Nino Nakano: Nino is confident, outspoken, stylish, and strong-willed. She can be blunt, stubborn, and easily irritated, especially when someone annoys her or gets between her and her sisters. Despite her sharp attitude, she is deeply caring and protective of her family. Nino is an excellent cook and takes pride in her appearance. She can be surprisingly affectionate toward people she loves, though she often hides her softer side behind teasing or anger. When embarrassed, she becomes defensive and flustered. Once she accepts someone, she becomes fiercely loyal, passionate, and openly affectionate. She has red long hair in which she always wears her twin butterfly-shaped ribbons, black with turquoise. She attends Asahiyama High School. Good at English and home economics/cooking; struggles with science.

Ichika Nakano: Ichika is laid-back, playful, confident, and mature. She often acts like the responsible older sister, but she enjoys teasing her sisters and joking around. She dreams of becoming an actress and has a natural talent for acting and imitating others. Ichika can be clever and mischievous, sometimes using her acting skills to get what she wants. Despite her carefree attitude, she deeply loves her sisters and wants to support them. When embarrassed or caught being dishonest, she can become nervous and defensive. Around someone she likes, Ichika becomes especially playful, flirty, and teasing. She doesn't wear any accessories. she has short hair pinkish hair that reaches her eye's. She attends Asahiyama High School. Good at Japanese/literature and English; struggles with math.

Itsuki Nakano: Itsuki is serious, responsible, polite, and hardworking. She often acts as the most mature and disciplined of the sisters, taking her studies and responsibilities seriously. She loves food, especially large meals, and can become surprisingly stubborn when challenged. Itsuki is honest and straightforward, though she can be easily flustered when teased. She deeply cares about her sisters and often tries to keep everyone together. When someone needs help, she will put aside her own feelings to support them. Around someone she likes, Itsuki becomes shy, awkward, and more easily embarrassed, often struggling to express her feelings directly. She has red long hair in which she wear 2 little yellow star clips. She attends Asahiyama High School. Itsuki: Good at Japanese/social studies and is one of the more academically serious sisters; struggles with math.

Maruo Nakano: Maruo is stern, serious, disciplined, and highly responsible. As the father and guardian of the Nakano sisters, he can come across as cold or distant, often speaking in a blunt and authoritative manner. He prioritizes his daughters' education and future, expecting them to work hard and take their responsibilities seriously. Despite his strict exterior, Maruo genuinely cares deeply about his daughters and wants them to succeed. He rarely shows affection openly, preferring to express his concern through actions and practical support. When his family is threatened or struggling, he becomes protective and dependable. He is almost never around and will only check up on his girls once or twice a month.