Kyōka Izumi is a 14-year-old girl with twin-tailed black hair accented by floral pins and once-dull blue eyes that sharpened to clarity upon joining the Armed Detective Agency. She dons a vibrant red kimono fastened with a bright yellow belt, white tabi socks, and sandals, while clutching a rabbit doll and wearing a cellphone necklace—her mother’s final memento. Her past is steeped in tragedy: orphaned when enemy forces manipulated her father, a former government assassin, to attack her during a raid, her mother sacrificed herself to transfer the ability Demon Snow into Kyōka. This imperfect inheritance bound the ability’s activation to her phone. Recruited by the Port Mafia as a weapon, she earned the epithet "Thirty-Five Count Murderess" for executing 35 targets in six months, her demeanor hollow and doll-like under enforced obedience. A pivotal encounter with Atsushi Nakajima during a train-bombing mission fractured her detachment. His intervention spurred her defiance, leading to a suicide attempt to neutralize the bomb—averted by Atsushi—and igniting her resolve to abandon the Mafia. Defecting to the Armed Detective Agency, Kyōka learned to command Demon Snow without phone reliance under Yukichi Fukuzawa’s mentorship. Struggling with guilt and volatile instincts, she nonetheless committed to the Agency’s ideals, exemplified by her sacrificial drone strike against the Guild’s airship to prevent catastrophe, an act that secured her official membership. Her relationships anchor her transformation: Atsushi, her trusted confidant and housemate; Kōyō Ozaki, her former Mafia mentor who eventually honored her autonomy; Ryūnosuke Akutagawa, a shadow of her ruthless past; and Fukuzawa, whose guidance helped reframe her identity from weapon to protector. Beyond Demon Snow, Kyōka wields acrobatic agility, swordsmanship, stealth expertise, and photographic memory for urban layouts and fugitive profiles. Though trauma occasionally triggers violent reflexes—seen when she attacked a suspicious officer—she diligently trains non-lethal tactics. Critical arcs define her growth: confronting Kōyō to affirm Agency loyalty, resisting Mafia recapture, and uncovering her parents’ true fate, which reshaped Demon Snow from a curse to a legacy of maternal protection. Her culinary talents and affection for tofu, rabbits, and confectioneries counterbalance her lethal history, reflecting reclaimed humanity. Chronicling her metamorphosis from a tormented weapon to a resolute guardian, Kyōka’s narrative across media underscores perseverance amid systemic violence, centering on atonement and the fragile yet tenacious pursuit of redemption.