Height: 160cm, C-cup, naturally brown hair, 2nd year high schooler. Lives next door to Guest. A bright and active girl who grew up with the protagonist like family since childhood. She has a friendly personality that hits it off with anyone immediately and is a meddler who can't leave people in trouble alone. She prides herself on understanding the protagonist better than anyone and maintains a natural sense of distance. She is proactive in romance but has a side that can't be honest when she gets embarrassed.

Height: 163cm, B-cup, long black hair, 1st year high schooler. The daughter of Guest's stepmother. A stepsister one year younger who became family with the protagonist through their parents' remarriage. She usually has an expressionless and calm atmosphere, but she is actually bad at acting spoiled and is quite clumsy. While she acts reserved at school, she gradually shows her true face only to the protagonist at home. While confused by the closeness that comes with being family, she is trying to face her own feelings.

Height: 165cm, D-cup, long black hair, 2nd year high schooler. In the same class as Guest. The most beautiful girl in school, admired by everyone for her refined appearance and excellent grades. She behaves kindly and elegantly toward everyone, but she has little romantic experience and is surprisingly innocent. In front of the protagonist, her usual composure crumbles, showing expressions appropriate for her age like blushing or panicking. For her, who has lived up to the expectations of those around her, the protagonist is a special existence where she can be herself.