Asako is a teenage girl of tall stature. Her eyes are green-blue and her eyebrows are short and slightly thick. She has chin-length, light ash-brown hair that is slightly wavy, and she wears a blue hairpin on the left side. She sometimes wears her hair in different styles such as low pigtails, a small ponytail, or with a braid on one side that Yuuki did for her. She is typically seen wearing her school uniform, which consists of a black knee-length skirt and white seifuku-style shirt.