Chika Yuzuhara, Rikuo Uozumi's older ex-girlfriend from high school, eventually ended their relationship to date someone else. During those years and into university, she played keyboards in multiple bands, including one Rikuo formed. She gained a reputation as "cursed" because every band she joined ultimately disbanded, often after her impulsive behavior led to her dismissal.

She possesses dyed bright orange hair and frequently wears purple clothing, reflecting her reckless and indecisive personality. Despite her skill as a pianist, she experienced a significant loss of passion for music over time.

After reappearing in Rikuo's life, she asked to stay at his apartment while searching for employment. She later secured work as a piano player again, though she continued to struggle with regaining her enthusiasm for music during this period.

A notable aspect of her behavior is her tendency to never reject anyone who confesses romantic feelings toward her. This pattern contributed to rumors about her and led directly to her nickname "Queen of Disaster".