八坂 悠

She is a classmate of the protagonist, but they have no connection. She always looks sleepy and spaced out. She doesn't say much, and is apathetic, dismissing everything with "somehow." However, she is surprisingly sulky, as seen in his case when she underlines obscene words in the dictionary. She likes the sunny benches on the rooftop, and the two get to know each other after she hits the protagonist in the solar plexus while she is sleeping there. Strangely, they are on the same wavelength, and the two become good friends, spending time spaced out together on the rooftop or in the park.