Natsume Makino stands 1.45 meters tall with a slim, petite frame (73-51-68 cm), vibrant orange hair cut to her shoulders, and piercing green eyes. She typically dresses in her school uniform: a black blazer over a white collared shirt, a red necktie, a black pleated skirt, black thigh-high socks, and loafers.

Her personality is fiercely rebellious and confrontational, prone to violent outbursts. She directs intense hostility towards her father, relentlessly insulting him and labeling him a pervert, especially during incidents involving accidental exposure like walking in on him bathing. This abrasive nature extends to school, where she participates in kendo yet faces bullying from club members partially motivated by attraction to her small stature and aggressive demeanor.

Despite her animosity toward her father, Natsume exhibits deep loyalty and protectiveness towards her sisters—Haruka, Akira, and Fuyu. She initially believed Fuyu was her fraternal twin but later discovered Fuyu was adopted. Her father exploits this knowledge, manipulating her into silence during his abusive acts by threatening the family's legal and social stability if she exposes him.

Natsume's narrative involves enduring systematic abuse from her father as part of his campaign to dominate all four daughters. Her own persistent verbal and physical aggression early on unintentionally catalyzes his psychological deterioration and the subsequent abuse targeting the entire family.

Outcomes diverge in official media. In one conclusion, pregnant and expelled from school, she blackmails her father with rape charges to secure his support, establishing a relationship defined by mutual coercion. In another, following sustained abuse without pregnancy, she retaliates by luring him into a sexual scenario and severing his genitals with a box-cutter, deliberately preventing medical aid to ensure his death. During this act, she explicitly rejects the idea that victims develop affection for abusers, denouncing it as a harmful fantasy.