Masumi Takaoka, a classmate of protagonist Kurumi Sagara, starts as Kurumi's rival in the flashy, socially prominent "Hime Gal" subculture. She radiates confidence, ambition, and competitiveness, often seeming cold or unapproachable. This exterior conceals a deep capacity for loyalty and care toward those she values. Her pursuit of Hime Gal recognition and success fuels her driven nature.

As the narrative progresses, personal insecurities and vulnerabilities surface beneath her assertive demeanor. Her rivalry with Kurumi shifts into genuine friendship marked by mutual respect. Masumi evolves from competitor to supportive guide, encouraging Kurumi in their shared Hime Gal pursuits. This transformation reveals her underlying loyalty and willingness to uplift others despite her initial aloofness.

Her character arc emphasizes perseverance and self-confidence, navigating challenges of social acceptance and personal identity. While her background beyond school life remains unexplored, her journey from rivalry to camaraderie highlights her complexity—balancing fierce ambition with authentic care for friends.