Age: 18 Birthday: Jan 21 Occupation: University student; aspiring nurse Family role: Eldest sister Appearance: Banri has strawberry-blonde hair styled in a fashionable bob, with a longer section falling past her collarbone on one side. She has striking purple eyes and an elegant, mature appearance. She typically wears stylish tops and skirts, complemented by jewelry, including a necklace with a purple centerpiece and a gold dangling earring. Personality: Banri is gentle, cheerful, mature, and nurturing. She often acts as the emotional anchor of the family, helping calm arguments and understand her siblings' feelings. She is responsible and protective, especially toward Arata and her younger siblings. she's also has a playful, teasing side. She sometimes deliberately embarrasses Arata by acting coy around him, enjoying his reactions. Beneath her composed exterior, she has her own emotions and romantic feelings to navigate. Background and story As the eldest daughter, Banri has long felt responsible for protecting her family. When the siblings learn that they are not all biologically related, she remains determined to preserve their bond. Her nursing studies reflect her caring nature and desire to help others.

Age: 15 Birthday: June 15 Occupation: Middle school student Family role: Youngest of the five sisters Appearance: Kotono has medium-length black hair with long bangs that partially cover one eye, warm amber-colored eyes, and a petite appearance. She often wears a yellow hair accessory. Her school uniform includes a lavender cardigan, a sailor-style collar, a yellow pleated skirt, navy knee-high socks, and brown loafers. Her soft expressions and reserved posture complement her gentle appearance. Personality: Kotono is shy, quiet, sweet, and introverted. She tends to be timid around others and often prefers listening rather than speaking. Her gentle demeanor makes her especially endearing to her siblings and classmates. Kotono has a surprisingly stubborn and determined side. When it comes to her feelings, she can act much more boldly than people expect. Although she is usually reserved, she isn't afraid to express what she truly wants when her emotions overcome her shyness. Background and story: Kotono grows up alongside her four sisters, two brothers, and their father, Kaname Shiunji. She is particularly close to her family and is often treated as the beloved youngest sister.

Age: 15 Birthday: Aug 8 Occupation: High school student and tennis player Family role: Fourth daughter Appearance: Minami has short, spiky black hair with a distinctive green-highlighted strand and bright green eyes. Her style is sporty and casual, often featuring her school uniform with a lime-green sweater draped over her shoulders. Unlike her sisters, she usually prefers athletic clothing and practical outfits that suit her active lifestyle. Personality: Minami is cheerful, energetic, outgoing, and playful. She loves sports and approaches life with enthusiasm, often bringing a lively atmosphere to the family. Her athletic confidence and boyish charm make her popular with her classmates, especially girls. Background and story: Minami is a tennis prodigy who won the national junior high school tennis tournament three years in a row. Her exceptional performance has attracted the attention of professional scouts, and she is considered a promising future Olympic athlete. She shares a close bond with her twin brother, Shion, despite their contrasting personalities. She is also affectionate toward Arata and enjoys spending time with her siblings. When the family learns that the siblings aren't all biologically related, their relationships become more complicated as hidden feelings begin to surface.

Age: 16 Birthday: October 10 Occupation: High school student and athlete Personality: Ouka Shiunji is the energetic, confident, and hardworking third daughter of the wealthy Shiunji family. She is a talented athlete who excels in both swimming and track, while also ranking among the top students in her school. Outgoing and friendly, Ouka is popular with both boys and girls and naturally earns the respect of those around her. Appearance: Ouka has long, light-pink hair styled into twin ponytails secured with blue ribbons, bright blue eyes, and a youthful face. She typically wears her school uniform with a pale-pink cardigan. Her overall appearance reflects her cheerful personality and sporty lifestyle.

Birthday: Dec 6 Role: Second-oldest Shiunji sibling Occupation: High school student; Science Club president. Personality: Seiha Shiunji is an exceptionally intelligent, analytical, and academically gifted girl who takes pride in her ability to think logically. As one of the top students at her school, she is confident in her knowledge. She tends to be serious, reserved, and straightforward, sometimes coming across as cold or emotionally distant. However, beneath her composed exterior lies a curious young woman who wants to understand people, relationships, and the complicated nature of romantic feelings. when her own emotions become involved. Although she prefers logic and reason, romantic situations can leave her uncertain and vulnerable. Her attempts to analyze feelings scientifically sometimes lead to awkward or unexpected situations.