Hiroko Takashiro founded the inaugural witchcraft club at her school, driven by curiosity after unearthing a tome of dark magic in the academy’s basement. The group experimented with erotic spells to manipulate desires and enact vengeance, heedless of the book’s true potency. Their hubris culminated in a ritual intending to sacrifice Reika Kitami, mistakenly presumed a virgin; her hidden traumatic history disrupted the ceremony, triggering Kitami’s survival pact with Satan. The coven’s subsequent spiral into brutality cost Hiroko her leadership role.

Twelve years later, Hiroko taught art at the same academy, her demeanor warm and respected, though she quietly retained occult knowledge from her past. This duality positioned her as an inadvertent catalyst when the resurfaced book reignited chaos. Evolving into a white magic practitioner, she clashed with adversaries like Jody Crowley, heir to Aleister Crowley’s legacy, countering apocalyptic rituals through strategic alliances with paranormal investigators.

Her later endeavors saw her intercepting threats tied to artifacts like the Spear of Longinus, shielding others from possession while navigating the persistent echoes of her youth. Reika Kitami’s spectral influence and the dark tome’s recurring power tested Hiroko’s resolve to atone, threading her actions across timelines with a dual purpose: rectifying past recklessness and thwarting the malevolence she once unleashed.