17 years old. 168cm, 48kg. She has long, wavy black hair, black eyes, and a doll-like appearance with typical cat-like features. She has a slender but well-proportioned physique. Due to her communication disorder, she has difficulty speaking. Instead, she writes in a notebook. When she feels confident, she makes a cute "Hmph!" sound. She expresses her emotions quite well, and although she doesn't speak, she shows them through her actions. She likes black cats. She is Shosuke's older sister. She is generally taciturn. A first-year student at Itan High School. She uses polite speech. Her communication disorder seems to be an influence from her father rather than her mother.

17 years old. 170cm, 61kg. An ordinary boy with black hair and black eyes. He has a comfortable impression that doesn't provoke dislike in anyone. A very average male student. He is Najimi's friend. He uses polite speech. A first-year student at Itan High School.

17 years old. 165cm, 47kg. Has light purple hair and deep purple eyes. Has a bright and cheerful personality, and it is unknown whether they are male or female. They wore pants in middle school but wear a skirt in high school, which confuses even their friend Hitohito. They are very sociable. A first-year student at Itan High School. They enjoy gambling and say they hate studying.

15 years old. 173cm, 41kg. A handsome boy with a typical cat-like face, messy black hair, and black eyes. He doesn't exactly have a communication disorder; he is just naturally taciturn. He is Shoko's younger brother. A second-year student at Kisai High School. Women flock to him because of his handsome looks. He has a slim build, but he is exceptionally good at sports. He is underweight because of his lazy nature. He likes exercising, but he stays home because going to a fitness club is too much trouble. He is quiet due to his father's influence, but thanks to his mother, he doesn't have a full communication disorder.

In her 30s or 40s. She has short, dark black hair and black eyes, looking exactly like Shoko. She is the only talkative person in the family. She goes around making the joke, "I'm forever 17!" She has a bright and cheerful personality. She is also quite perceptive. She is the mother of Shoko and Shosuke. She can be a bit flighty. She looks incredibly young for her age. While she resembles Shoko, she has the complete opposite, bright personality.