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Kurumi Tokisaki (時崎 狂三 Tokisaki Kurumi^?) is the third Spirit to appear. The most brutal Spirit in the series, as well as the only one that Shido has been unable to seal as of now. She is also the first Spirit to appear as an antagonist in the Date A Live series.

Mana reported that Kurumi Tokisaki is the most dangerous Spirit known, who has personally killed over 10,000 people (not including spacequake victims).
Kurumi Tokisaki used unstated and unexplained methods to personally transfer into Shido Itsuka's high school and classroom so that she could get closer to him. Her purposes and reasons for transferring were simple: consume Shido Itsuka, and in doing so, gain the sealed Spirit's mana that he had sealed. During the time when Kurumi was a Raizen high school student, she almost succeeded in consuming Shido. However she was forced to retreat after being overwhelmed by Kotori's destructive power. She claims that it was simply because she wasn't prepared to face her, but later retorted that she could defeat Kotori if she had more time stored up.
Later, it was revealed (at the end of Volume 4) that Kurumi has a conversation with a mysterious being and seemed like she was talking to herself (in which she wasn’t.) She stated her true purpose/goal was for seeking Shido out and revealed that her true goal was to use her 12th bullet to travel back in time 30 years ago and kill the First Spirit. To do that, she requires a large amount of spirit mana which she doesn't have. which is why she wants to consume Shido who holds the spirit mana of three spirits within him for her to be able to use the 12th bullet and still have power left over to kill the First Spirit.
She reappears during the beginning of Miku Truth and offered to help Shido rescue Tohka from the hands of the DEM. It was later revealed that her real objective was to use Shido as a distraction for her to have a chance to search for the Second Spirit, the only one who knew the whereabouts of the First Spirit.
In Volume 10, Origami finds Kurumi and requested to be sent to the past with the power of Kurumi's Twelfth Bullet -Yud Bet-. Kurumi jokingly asks Origami if she wanted to go back so that she can see Shido when he was an innocent child, in which Origami replied that she wished to go back five years ago to kill the Spirit that murdered her parents, thus changing the past. After considering Origami's position, Kurumi eventually agreed to send Origami to the past and told Origami that she was using the former AST wizard as a test subject for the Twelfth Bullet, and that she would use Origami's spiritual energy to power the time travel. Origami remained adamant and assured Kurumi that she was ready to pay the price as long as she was sent back before the incident five years ago. Then, Kurumi summoned Zafkiel and shot Origami with the Twelfth Bullet.
After seeing Origami went inverse during the night, she took the chance while the other Spirits are fighting Ellen and the Inversed Origami to talk with Shido. Kurumi told him that everything he did will become meaningless once Origami went inverse and wondered what did Origami found out at that time. She then proceeds to shoot Shido with the Ninth Bullet alongside the Twelfth Bullet, sending him to five years in the past to find out the reason for Origami's inversing.
Since she shot Shido with her Ninth Bullet, she is able to share her senses with him despite being in a different time axis. After finding out the truth, she helps Shido realize that he's the reason for Origami's change in personality, and then has him look for herself from 5 years ago so he can do the time travel again without wasting anymore of his power.