Kurumi Tokisaki is a Spirit bearing the codename Nightmare and recognized as the third and most dangerous Spirit encountered in the Date A Live story. Her appearance is elegant and striking, with long black hair often worn in twin tails, pale skin, and crimson eyes that carry a clock-like design. Through the events of Mayuri Judgement, she operates largely from the shadows rather than as a direct participant in the main group’s activities, inserting herself into the crisis on her own terms.

Her personality is a stark duality. Outwardly she can present the gentle demeanor of a polite, soft-spoken high schooler, a mask she uses to blend in and manipulate situations as needed. Beneath that surface lies a persona capable of cold calculation, manic laughter, and lethal violence. She harbors a deep-seated distrust of humanity, viewing human lives as expendable resources to replenish her consumed time, yet her killings are not uniformly indiscriminate. A twisted sense of justice occasionally surfaces: she has been known to target individuals she deems morally corrupt, such as would-be abusers or animal torturers, and she displays an uncharacteristic softness toward small animals, particularly cats.

At her core, Kurumi is driven by a long-term, single-minded obsession: to find and eliminate the First Spirit, the being whose existence she holds responsible for the origin of all other Spirits and the catastrophic spatial quakes that accompany them. She believes that by acquiring enough power, particularly the sealed Spirit energies within Shido Itsuka, she can return to the past and prevent that calamity. In Mayuri Judgement, this objective remains a backdrop to her actions. She appears independently to observe the situation and, when the rampaging Angel Kerubiel threatens Shido and the other Spirits, she secretly saves Shido at a critical moment, acting as an unexpected protector rather than an outright antagonist.

Her relationship with Shido Itsuka is layered with fascination and necessity. Initially she sought to consume him entirely to take his sealed powers, but over time a more complex attachment develops. In the film, she provides cryptic guidance and, during the climactic battle, steps in to preserve his life, hinting at a personal investment that goes beyond pure utility. She is not one of the Spirits sealed by Shido and refuses to be absorbed into his circle; her alliance with him remains transactional and tense, built on her own hidden agenda. Nevertheless, the film shows her investing in his survival rather than simply exploiting him.

In combat, Kurumi wields an Angel named Zafkiel, a massive clock-like entity that facilitates her command over time and shadow. Her primary ability is chronokinesis: she can slow, accelerate, or stop time, travel through temporal layers, and create duplicates of herself from past moments. These clones are extensions of her consciousness, each carrying her memories and powers, allowing her to overwhelm opponents with sheer numbers or execute complex strategies. She can also generate and manipulate shadows to restrain targets or travel between locations, and she can summon spacequakes at will. To activate her time-based abilities, she uses a pair of flintlock and musket firearms, firing Zafkiel’s numbered bullets at herself or her targets in a clockface ritual.

Throughout Mayuri Judgement, Kurumi remains a wildcard. She does not mature or soften in traditional terms; rather, her actions confirm that beneath the monstrous methods lies a kernel of purpose that occasionally aligns with the greater good. Her intervention during the final conflict underscores that she is not an enemy to be defeated but a force of her own design, choosing to assist when it serves her unknown ends and, perhaps, when a genuine fragment of care for Shido Ituska surfaces.