"Calamity of a Zombie Girl" is a supernatural horror anime that revolves around the resurrection of a centuries-old noblewoman and the ensuing chaos that unfolds. The story begins with a group of university students, including the protagonist, Akira Kamiya, who are conducting research on immortality. Their experiments lead them to the mummified remains of Marquise Lucrezia de Borgia, a historical figure rumored to have dabbled in dark rituals. Using a mysterious elixir, the students inadvertently revive Lucrezia, who awakens with her memories intact and a thirst for blood.

Lucrezia, now a powerful and vengeful zombie, seeks to reclaim her lost power and exact revenge on those who wronged her in life. Her resurrection triggers a series of supernatural events, including the awakening of other undead creatures and the disruption of the natural order. As Lucrezia begins to manipulate the living and the dead, Akira and her fellow researchers find themselves caught in a deadly struggle to stop her. The narrative explores themes of immortality, the consequences of tampering with life and death, and the moral dilemmas surrounding scientific ambition.

The characters are central to the unfolding drama. Akira Kamiya is portrayed as a determined and resourceful student, driven by curiosity but increasingly burdened by the consequences of her actions. Lucrezia de Borgia is depicted as a complex antagonist, blending aristocratic elegance with a ruthless desire for power. Supporting characters, such as Akira’s peers and a mysterious alchemist who aids them, add depth to the story, each contributing to the escalating tension and moral conflicts.

The plot is structured around a series of escalating confrontations between the living and the undead, with Lucrezia’s schemes growing increasingly elaborate and dangerous. The anime blends elements of gothic horror, historical intrigue, and modern scientific exploration, creating a narrative that is both atmospheric and suspenseful. The story culminates in a climactic battle that forces the characters to confront the ethical and existential questions raised by their actions, leaving the fate of both the living and the undead in question.