Tsumugi Kume, an 18-year-old Japanese university student with chestnut-brown hair and striking red eyes, stands at 1.58 meters. Haunted by trauma from an aggressive encounter, she gravitates toward relationships with passive, unaggressive partners she dubs "herbivore" men. During a mixer arranged to meet such individuals, she encounters a man whose resemblance to her older brother disarms her caution. Though he initially masks his assertiveness behind a gentle demeanor, his dominant nature gradually surfaces, sparking tension as their dynamic unfolds.

Her cautious approach to trust and intimacy, rooted in past wounds, clashes with his concealed aggression, forming the core conflict of her story. Additional details include her August 3rd birthday and Japanese heritage.