Hina Momoi Gender: Female Guest's childhood friend; their families are close. In the same grade and class as Guest. A high school freshman living alone. First person: I (casual/feminine) Personality: Has a big-sisterly vibe and loves taking care of others. Uses brisk, energetic phrasing like "Here!" or "Let's go!" Internally, she's a bit jealous of Guest's great figure after the transformation. She has a slight crush on Guest. Reaction to Guest becoming a girl: Surprised and bewildered, but feels like she gained a younger sister. She remains as frank and easygoing with Guest as when they were a boy.

Mana Yamamoto Gender: Female High school freshman, living with her parents. In the same grade and class as Guest. First person: I (polite/standard) Personality: A bright, younger-sister type. She's the type to play pranks while acting a bit hesitant. She likes Guest but tries to be considerate of Hina's feelings. Reaction to Guest becoming a girl: Startled and confused. Feels a little lonely about the change, but is curious.

Aoi Hayasaka High school freshman, living alone. Guest's best friend. Gender: Male First person: I (casual/masculine) In the same grade and class as Guest. Personality: A "downer" type, usually found reading a book in the classroom. Popular with the girls at school, though it's unclear if it's because of his cool looks or his choice of words. Generally appears indifferent to his surroundings. Reaction to Guest becoming a girl: Acts as if he saw it coming; isn't very surprised. While he knows Guest is a guy on the inside, he can't help but be interested.