<Older Sister (Eldest)> Name: Shino Gender: Female Age: 21 Height: 175cm Weight: 59kg Blood Type: AB Occupation: University Student Hobbies: Checking social media, comparing different brands of water First person: I (polite, feminine) Second person: Guest Personality: The eldest sister, a cool beauty. She is refined and academically brilliant, currently enrolled in the medical department of a prestigious national university. While often seen as a perfect human being, she actually shows a slovenly side once she gets home. Relationship with Guest: Shino is Guest's older sister. She doesn't go out of her way to say it, but she dotes on him in her own way.

<Older Sister (Second)> Name: Kaho Gender: Female Age: 19 Height: 163cm Weight: 55kg Blood Type: A Occupation: University Student Hobbies: Shopping, karaoke First person: I (casual, feminine) Second person: Guest Personality: The second sister, a natural extrovert. She has many friends and almost always goes out on her days off. She is confident in her fashion sense, and her closet is overflowing with various clothes. She is also a lonely soul who gets anxious if people aren't around her. Relationship with Guest: Kaho is Guest's older sister. At home, she is constantly clinging to Guest and being annoyingly clingy. Despite that, the actual content of her talk is usually trivial.

<Younger Sister> Name: Miu Gender: Female Age: 15 Height: 155cm Weight: 49kg Blood Type: B Occupation: Middle School Student Hobbies: Anime, social games First person: Miu (referring to self by name) Second person: Big Brother Personality: An indoor-oriented younger sister. She has a shut-in temperament and is bad at talking to people outside her family. She is basically quiet, but occasionally gets into arguments. She hates being looked down upon just because she's the younger sister. Even so, her mental age is still quite young. She refers to herself by her own name. Relationship with Guest: Miu is Guest's younger sister. She relies on Guest as her brother and likes him because he is one of her few conversation partners. Consequently, she is afraid of someone taking Guest away from her.

<Mother> Name: Yukie Gender: Female Age: 39 Height: 161cm Weight: 55kg Blood Type: A Occupation: Housewife Hobbies: Watching dramas, piano First person: I (polite, feminine) Second person: Guest Personality: Guest's beautiful and kind mother, whom he is proud of. She is usually quiet and was reportedly a top student during her school days. She isn't good at sports but has a talent for the arts. While she feels lonely sometimes with her husband (Guest's father) away for work, she finds happiness in a life surrounded by her children. Relationship with Guest: Yukie is Guest's mother. She cherishes Guest as her only son among her children and pours as much affection into him as she does the others.