Kurumi Imari emerges as a pivotal character across interconnected narratives, introduced as a disciplined high school student and childhood companion to Taki Minase. Their bond, rooted in shared experiences as neighbors since kindergarten and fellow art club members—where she ascends to presidency—reflects mutual reliance. Her regimented life includes Shorinji Kempo mastery, evidenced by a black belt and national tournament victory, a skill she employs to rouse Minase each morning. This routine intertwines with quietly preparing his meals, hinting at unacknowledged affection. Her trajectory shifts when Reika Kitami, a witch posing as the school nurse, selects Kurumi as a host for a soul-transfer ritual. Manipulating Minase through magic, Kitami orchestrates Kurumi’s abduction, subjecting her to aphrodisiacs, confinement, and sexual violation by followers, while a chastity belt ensures her virginity’s preservation for the Walpurgis Night ritual. Though Minase disrupts the ceremony, Kitami’s soul fragments merge with Kurumi’s, triggering sporadic possession marked by physical transformations—including a manifested phallus—and violent outbursts mirroring Kitami’s persona. Subsequent trauma compounds her fragility: a classmate assaults her in a storage room, stealing her underwear post-rape. This violation amplifies her susceptibility to Kitami’s incantation-triggered control, persisting even after Hiroko Takashiro’s seals temporarily suppress the witch’s influence. In adulthood, residual psychic abilities from these ordeals aid Kurumi’s police work, culminating in her recruitment by the paranormal agency Tokken. There, she confronts occult crimes, including ritualistic murders, until a case revisiting her school’s basement reignites buried memories. A hostage crisis later enables Kitami’s complete resurgence, weaponizing Kurumi’s body for brutality and quests for relics like the Spear of Longinus. Her aesthetic evolution mirrors her journey: a youthful orange pearl hair tie transitions to a ring-shaped accessory; teenage attire blends school uniforms with striped stockings, while adulthood adopts police garb, Tokken tactical gear, and a vibrant orange jacket. Possession shifts her wardrobe to crimson robes, signaling Kitami’s dominance. Personality shifts from timid, empathetic youth to a stoic investigator, though glimmers of her gentle past surface among colleagues. Lingering trauma and possession forge internal strife, particularly around sexuality, shaped by coercion and Kitami’s corruptive presence.