Yui is a young girl with shoulder-length, bob-shaped hair, side-swept to her right, with shorter strands hanging above her eyes. She has fair skin, an athletic build, and cerulean eyes, and she's usually seen wearing a neutral expression on her face. Yui is a quiet girl who rarely expresses emotions; some classmates even consider her a kūdere. Despite her silent demeanor. Although she rarely talks and has no expression, Yui isn't moody. When she's happy, she says "Mm!"