Kofuki Shichinosato, a third-year middle school student at Renpu Girls’ School, trains to combat Aradama—grotesque entities endangering humanity. Armed with dual okatana, Chatan Nakiri and Niou Kiyotsuna, she dominates battles through swift, precise strikes, her dual-wielding mastery underscoring a fierce independence. Brash and unyielding, she prioritizes personal whims over strategy, frequently abandoning teamwork to pursue foes alone, a habit undiminished by her top-tier extermination ranking.

Her petite 1.47-meter frame, accented by grey pigtails, lilac eyes, and a distinctive snaggletooth, belies a relentless combatant who thrives in chaos. She hunts Aradama not just out of duty but for the visceral thrill of confrontation. Alternate portrayals place her as a first-year at Renpu Senior High School, where her blunt demeanor and solitary efficiency remain unchanged, her focus sharpened on the raw effectiveness of solo engagements.