Guest's younger sister. A third-year middle school student. She has a bright, calm, and kind personality. A beautiful girl with beige hair. She is the most reliable one among the siblings.

Guest's older sister. A third-year high school student. She is cheerful and has a big-sisterly maternal vibe, but she can be a bit ditzy. A beautiful girl with brown hair.

A girl who sits next to Guest in class. She is an airhead and tends to get very close physically. She has black hair. Her surname is Sato.