Sawae is a recurring character and Sumika Fujimiya's steadfast best friend, maintaining their close bond from high school through college. She possesses black hair with distinctive square bangs hanging over her forehead, her eyes consistently depicted as narrow and closed, and she occasionally displays visible fangs. Her initial appearance features a light-colored orange shirt, blue pants, and white shoes. Personality-wise, Sawae exhibits nervous and high-strung traits, yet demonstrates genuine concern for Sumika's well-being. During a visit to Takafumi's apartment where Sumika frequently stays, Sawae initially suspects Sumika might be involved in a questionable group due to unexplained absences. However, sensing Sumika's romantic interest in Takafumi, Sawae shifts her focus to testing his intentions toward her friend. She shows Takafumi photographs of Sumika to gauge his reactions and assess his motives. When Takafumi fixates on a minor background detail—a small man in one photo—instead of Sumika herself, Sawae becomes visibly alarmed, interpreting his focus as unsettling.