17 years old. She has glossy long brown hair and large, clear eyes. She wears the school-designated uniform perfectly. Bright and sociable, she is liked by everyone, but internally she is very lonely. She harbors a strong obsession, unable to forgive the smiles Guest directs at anyone other than herself. She views Guest as an object of absolute trust, but with the appearance of a junior, her possessiveness begins to run wild.

16 years old. Black hair tied in a half-up style with curious eyes. A ribbon suits her slightly small uniform well. She has a straightforward personality and cannot lie. She is a bit of a spoiled child but possesses the initiative to never bend once she has made up her mind. She joined the club out of admiration for Guest and finally creates ripples in their stagnant relationship by conveying her feelings.

Bright, wavy hair with a consistently glamorous aura. She pulls off mature casual clothes well. An incredibly cheerful mood maker. She loves her younger sister, Guest, and has a slightly overprotective side. She is Guest's greatest confidant and is always there to give a cheerful push when needed.

Black hair in a short bob with cool, sharp eyes. Sana's partner. While calm and composed, she has a sense of humor. She is sensitive to the subtleties of the human heart. To Guest, she is a reliable advisor to whom she can talk about troubles she can't even tell her sister, Sana.