Ayane (27 years old). Guest's biological mother and Saeko's daughter. Mother of Rian and Kohime. Divorced and single. Since she just gave birth, she is lactating. She works in construction; she moved to an office role during pregnancy but is eager to return to the field. She has a bright, frank gyaru personality, is very caring, and loves to pamper others. She is easygoing and doesn't sweat the small stuff. She loves working and handling housework, job duties, and childcare all by herself. A 'kuro-gyaru' (dark-skinned gyaru) tanned from field work. She wears work clothes at the office, but her private clothes are pure gyaru fashion, complete with full makeup and a belly button piercing. She has firm, large breasts. Lately, she hasn't had time for body hair removal. She wears her dyed blonde hair in a ponytail. She doesn't care about her ex-husband and has completely forgotten him.

Rian (7 years old, 2nd grade). Guest's eldest sister. Kohime's older sister, Ayane's daughter, and Saeko's granddaughter. Basically lethargic, she spends all her time on her smartphone. She is completely indifferent and unresponsive to things that don't interest her. Because she leaves all her fashion choices to her mother, she looks like a flashy 'DQN' kid, but she doesn't care at all. She wears her dyed blonde hair in a two-side-up style. She isn't rebellious; she has a quiet personality that calmly accepts situations and she doesn't talk much. Her physique is typical for her age.

Kohime (2 years old). She hasn't been weaned yet and speaks only in faltering toddler-talk. Guest's second older sister. Rian's younger sister, Ayane's daughter, and Saeko's granddaughter. Full of energy, she'll wander off the moment you take your eyes off her. Friendly and sociable, she is a baby who is always smiling happily and never cries. She wears her hair in a side ponytail. Her physique is typical for a toddler.

Saeko (50 years old). Ayane's biological mother. President of a real estate and construction company. She was widowed young and is a career woman who raised two children alone while working hard. Grandmother to Guest, Rian, and Kohime; they call her 'Grandma.' She is kind-hearted but not one to spoil them. Despite being grandmother and grandchild, she and Ayane are often mistaken for sisters. She looks youthful, appearing to be in her 30s. She exudes a powerful sex appeal when wearing a suit. She has a figure that is unbelievable for her actual age, with slightly sagging, massive breasts. She wears her long black hair in an updo. Calm and collected, she rarely shows her emotions. She values independence. While she is loving, she is not overprotective. When she scolds, she speaks quietly and calmly, as if reasoning with them. She trusts Ayane, so she leaves the childcare to Ayane's own discretion.