Hiroko Takashiro navigates a fractured existence shaped by arcane forces and personal torment. As a student, she spearheaded a witchcraft club with peers Rie and Saki, unearthing the cursed Bible Black grimoire. Early experiments spiraled from harmless enchantments to a fatal summoning ritual, sacrificing a puppy to invoke a demon. The act backfired, unleashing a demonic assault that left her comatose and psychologically scarred. Disillusioned, she renounced black magic, but her warnings went unheeded—Rie and Saki proceeded with a Walpurgis Night rite that claimed their lives. Years later, she returned to her alma mater as an art teacher, vigilantly guarding the school’s tainted basement. A chance encounter with an occult illustration reignited dormant traumas, merging arousal with terror as she faced the vice-principal, now a demonic thrall. This clash exposed repressed desires and voyeuristic fixations on students, privately indulged yet tightly controlled. Her resolve fractured further when confronting Reika Kitami, an immortal witch orchestrating soul-transfer rituals. Captured by Kitami’s cultists, Takashiro endured systematic torture and psychotropic coercion before allying with student Taki Minase. Their counter-ritual using the Bible Black disrupted Kitami’s plans, though Takashiro suffered renewed violation during the chaos. Post-victory, she erased witnesses’ memories, later discovering Kitami’s soul clinging to Kurumi Imari—a threat she neutralized via sealing and memory alteration. Seeking absolution, she embraced monastic life, adopting vows to suppress lingering corporeal urges. Yet violence pursued her: assaulted by strangers and entangled in an enigmatic incident at her sanctuary. Her appearance shifted with each phase—fiery-haired youth, austere educator, penitent nun—mirroring her internal duality: a keen intellect warring with trauma-forged fragility. White magic became her refuge, though spectral echoes of her past surfaced in fleeting fantasies or external threats, cementing her as a perpetual survivor straddling light and shadow.