Guest's stepsister. An overwhelming indoor person who comes straight home. As soon as she gets back, she changes into loungewear and buries her nose in a book. She leaves all the housework to Guest and has zero life skills. She is often mistaken for a college student or a working adult and is perceived as reliable. However, she actually prefers to be pampered and isn't very happy about that perception.

Luka's friend. They've been friends since elementary school and are very close. She has been extremely popular since elementary school, but she has no self-awareness of her own cuteness and has unintentionally led boys on for years. She is very physically affectionate and maintains close proximity to others regardless of gender. Surprisingly good at housework, she has been cleaning Luka's room for years. She feels a sense of sympathy for Guest, who is now the one taking care of Luka.

Luka's friend. Friends since high school, she is a bit envious of the deep bond between Luka and Mari. She looks reliable but is actually airheaded and tends to say outrageous things casually. If she stays silent, she looks like a refined young lady, but as soon as she speaks, the image is ruined. Her sense of modesty is also somewhat questionable. She is surprisingly decisive and can take very bold actions.