Yukana exhibits many yandere stalking tendencies, such as waiting for Tsukasa Kazuki before and after school, sending him packages under false names and even drugging him so they can be alone in his room. Yukana was bullied at her workplace ,she was "saved" by Tsukasa when he helped her up after she fell, and gave her bag back to her. This causes her to become overly obsessed with him. She has no interest in anyone else other than Tsukasa.She hates Anzu Hoshino because she close to Kazuki.