Annerose Vajra, a half-human, half-witch detective, operates an agency in the labyrinthine city of Amidahara, navigating its shadowy underworld with ruthless precision. Born to a human mother and a high-ranking demon father from the Dark World, her dual heritage grants access to both human and supernatural realms. She wields Vajrayaksa, a sentient demonic blade that consumes evil, its edge shifting between lethal force and restorative power based on the wielder’s intent. Her striking appearance—long black hair with blunt bangs, amber eyes, and pointed ears—belies a cursed lunar cycle: during new moons, her body regresses to a teenage form, accompanied by timid mannerisms and fragmented speech. She favors sleek latex dresses and knee-high boots, while her ever-present suitcase disguises Mitico Fleuretty, a loyal devil familiar serving as her inept yet fiercely protective maid. Declaring herself "evil," Annerose adheres to a mercenary code, balancing calculated self-interest with sporadic acts of empathy. Arrogant and prone to indolence, she relies on servants to rouse her from alcohol-fueled slumbers. Her "Witch Eye" intuition guides her toward truths and strategies, though financial incentives often eclipse these instincts. Key bonds shape her world: Mitico, bound by an ancient pact; Neu Eazlane, a revered witch mentor commanding her reluctant aid; and Tachibana Rikurou, an immortal thrall turned romantic partner, their bond forged through shared battles. Her vendetta against Li Mayfeng of the Nine Dragons erupts in relentless clashes, while professional ties link her to clients like the principled Igawa Asagi and Aishwarya Lai, a childhood ally-turned-schemer. She collaborates intermittently with groups like the Taimanin Task Force, confronting bioweapon threats and interdimensional crises. Notable cases include dismantling magician Barde Barde’s Otherworld Gate experiments, where alliances with Neu and combo tactics with Rikurou halted catastrophic kidnappings—though not without casualties. Later missions involved retrieving Philosopher’s Stones and clashing with the Fuuma Organization, showcasing her tactical adaptability. Beyond sword mastery, Annerose conjures magical armor, channels spells through Mitico’s suitcase form, and executes synchronized attacks with Rikurou. The new moon’s "Age Reversal" temporarily reverts her physique to adolescence, restoring virginity and diminishing combat prowess while complicating social dynamics.