Yuki Tsukumo/Synopsis

History
Years ago, she appeared to the elementary school student, Aoi Todo. Asking him what type of women he was into, she introduced the boy into the world of jujutsu sorcery.

Gojo's Past Arc
On August 2007, Yuki meets with Geto, and talks about how they can stop cursed spirits from being created. Yuki tells him that she has managed to figure out two ways for that to happen. Geto realizes there's a third possibility: the extermination of non-sorcerers. Yuki discusses the idea with him and asks about his conflicting feelings towards normal humans. She tells him that he will soon come to his conclusion. After talking, the two part ways. Yuki leaves reassuring Geto that Tengen has stabilized.

Shibuya Incident Arc
Yuki arrives just in time and manages to save everyone from being crushed by Uraume's Ice Fall technique and asks Pseudo-Geto what type of girls he likes. As she asks him if he remembers their conversation about how to create a world where curses no longer exist, she thinks to herself that she must buy time for Larue. Yuki proceeds to explain that no matter what method one adopts, humans will continue to evolve. She then says that the next stage of humanity is breaking away from cursed energy. Geto refutes and says that it instead lies in optimizing cursed energy. He mentions that he thought Yuki broke away from that method 12 years ago when Toji Zenin died years ago. Yuki explains to Geto about how his method has a large hole and adds on that Tengen's barrier is necessary for optimizing cursed energy. Geto merely laughs and says that they have different objectives and says that he does not wish for a world where cursed spirits don't exist or a peaceful world. He says that non-sorcerers, sorcerers and cursed spirits are all possibilities of cursed energy in the form of human beings and includes that there must be more potential in humans.

Yuki turns around to Yuji and asks if there's a cursed spirit called Mahito where Yuji tells Yuki that Geto absorbed him. Just after informing her of this, Geto activates Idle Transfiguration and Tengen's barrier starts cracking. Yuki is left shocked as she confronts Geto and asks what he's done. He says that he has remotely casted Idle Transfiguration on two type of non-sorcerers who have been already been marked. He reveals that he adjusted their brains for sorcery and gave them strength as vessels along with the ability to use cursed technique. Geto adds that he has broken the seal on the cursed object and will have them fight each other. Yuki says that a thousand isn't too many and that Geto shouldn't underestimate human rationality. Geto refutes this and says everything has an order and he wouldn't make such an oversight. Yuki gets annoyed by Geto and turns to face Yuji and asks him to beat Geto up where Yuji fails to get up and apologizes. When Momo says that there might still be more of them and suddenly realizes that there's no backup for Mai, Yuki assures her that her comrades are there to protect Aoi and Mai.

Itadori's Extermination Arc
Yuki is alone as she apologizes to her comrades and says that she will deliver the kids who were there to confront Master Tengen.

Perfect Preparation Arc
Yuki is with Maki at Tokyo Jujutsu High in hiding as Yuji, Yuta, Megumi, and Choso walk into the room they're in. Yuki explains how Maki is fine, but that even with a reversed cursed technique, the burn scars will nevertheless remain. She adds that she expected nothing less of someone who is physically gifted through a heavenly restriction. Yuki then says that the reason behind why Maki is still alive is because of her physical toughness, not curse resistance. Before Megumi is able to explain about Tengen's barrier, Choso steps in and does it himself. Choso says that he has a connection to the rest of the Death Painting Wombs, and he should be able to provide some guidance throught his technique. Yuki seems to be pleased when she hears that. When Yuji and Choso open the door, that leads to where the rest of the Death Painting Wombs and Master Tengen are residing, Yuki tells the group that there's an elevator that leads down to where Tengen is. When Yuji sees the blood stains on the froung and wonders what happened there, Yuki tells the group that something happened there 11 years ago. She adds that that's when everything started to get distorted.

She leads the group to the main shrine, but when they enter they are greeted with nothing. Yuki says that it's because it's rejecting them, thinking to herself that it might possibly be rejecting only her. Yuta says that Tsumiki doesn't have enough time and tells the group to leave just as Master Tengen appears, greeting them all, except Yuki, and asking why they're leaving so soon. Yuki seems to be displeased with the fact that Tengen ignored her. She asks Tengen if they're going to say hello, but Tengen says that it isn't the first time that they've met.

Yuki then asks Tengen why they closed off the Tombs of the Star Corridor, and they say that they were worried Yuki was aligned with Kenjaku. When Yuki asks who Kenjaku is, Tengen reveals that it's the sorcerer who was once Noritoshi Kamo and now is inhabiting Suguru Geto's body. Yuki says that the word implies compassion, and in the case of Kenjaku, there is none, therefore it's meaningless. When Yuji suddenly asks Tengen why they look the way they do, Tengen says that they are immortal but aren't immune to aging, and Yuki figures that's the reason why their voice is proliferate and also thinks about how there wasn't another Star Plasma Vessel 11 years ago. When Megumi and Yuta asks Tengen about Kenjaku's objectives and how to unlock the Prison Realm, Tengen says that there is one condition and asks Yuki, Yuta Okkotsu, or Choso to chose who will remain as his two guards. Yuki objects to this and says it isn't fair because they haven't told them why and for how long they need to do it.

Yuki listens to Tengen talking about how Kenjaku's objective is to force the evolution of all human beings throughout Japan, but Kenjaku cannot turn all humans into sorcerers via the manipulation technique, as he lacks the cursed energy to do so. Tengen reveals that the method Kenjaku has chosen is to merge humankind with themselves. They add on that if humankind evolves and only one person rages out, the world will end, as there would be no boundaries between individuals, so evil would instantly spread. Yuki asks them to explain it, and Tengen says that the impurities of a hundred million people would flood the world, and what happened to Tokyo would happen to the entire world as well. When Maki asks why they don't just refuse to merge, Tengen says that is the problem: now that Tengen has evolved, they are more cursed spirit than human which makes them a target for cursed spirit manipulation, shocking everyone including Yuki herself.

Tengen tells them that considering Kenjaku's abilities as a sorcerer, he might be able to absorb them if they encounter each other. They add that this is the reason why their main body is rejecting everything at the Tombs of the Star Corridor. Yuta wonders if that's the reason why they want guards, and Tengen gives a confirmative responce. They tell them that Kenjaku is the second most powerful barrier user after themselves, and Yuki asks them why this all has to be happening now of all times, and says that Kenjaku prevented Tengen's merging with a Star Plasma Vessel, forced their evolution and also wants to consume and control them through cursed spirit manipulation. She adds on that Kenjaku was apparently involved with Sukuna and has been a sorcerer for at least 1,000 years.

Tengen tells her that they, the Star Plasma Vessel, and the Six Eyes are all connected by fate. After having lost twice to a sorcerer with the Six Eyes in the past, Kenjaku had switched to sealing instead of eradicating the Six Eyes and thus began searching for the Prison Realm because two bearers of the Six Eyes cannot appear at the same time. Then came a boy with curse manipulation and the unexpected happened: Toji Zenin's intervention. Tengen tells them that he was physically gifted through a heavenly restriction and was an anomaly who had zero cursed energy, and destroyed the path that was outlined for them by fate. That's when all the pieces suddenly came together, other than for the Prison Realm which fell into Kenjaku's grasp six years ago.

When Megumi asks why the culling game is happening, Tengen explains the culling game uses the participants and the boundaries binding barriers in a ritual that conveys to the human beings of this country to the other side. And with that, Kenjaku will begin the merging with themselves, however, to preform the ritual, he has undertaken certain binding vows. They add on that one stipulates that he isn't the game master and this game doesn't work in their favor because even if Kenjaku is killed, the culling game will continue until all participants are either dead or the players refuse to participate and die. Yuji notices that Megumi is upset by this but is unsure why. Yuta concludes that they have no other choice but to participate and add a rule that allows Tsumiki and other unwilling participants to safely get out. Megumi adds that they also should free Gojo because he would be able to settle everything on his own.

When it comes down to deciding who would be staying behind to guard Master Tengen, Yuki and Choso step up for that position. Choso tells Yuji that he will need either Okkotsu or Yuki's help especially if Kenjaku comes for Tengen. Yuki adds on that she still hasn't finished talking with Tengen and turns to Yuta who agrees and says that he doesn't want to leave the others. Tengen thanks them all and pulls out a new object that is necessary for freeing Satoru Gojo and reveals that it's the "back" of the Prison Realm. Yuki says that she's never heard of it, and Tengen explains that before Kenjaku found the Prison Realm, it was outside of their barrier and believes that it was overseas. Tengen tells them that Gojo is sealed inside of the rear gate as well. They add on that to break it open, they will need the Inverted Spear of Heaven that nullifies cursed techniques and or the Black Rope that disrupts and cancels cursed techniques. Unfortunately, both items have either been destroyed or sealed by Satoru Gojo years ago. Yuki asks Tengen if there's a way to break Gojo free, and Tengen says there is. He reveals that among the players participating in the culling game, there is a sorcerer from 1,000 years ago who calls herself an Angel and that her cursed technique can extinguish any cursed technique.

Tengen proceeds to explain that there are 10 colonies that connect to a barrier that send humans from Japan to the other side. Yuki asks if the reason why Hokkaido isn't there is because of jujutsu society's barriers, and Tengen confirms it to be true before adding on that Hokkaido is established as vast sacred land. Tengen says that conveyance to the other side may sound exaggerated but a curse fell on everyone in preparation for merging. Megumi asks how long the ritual will take, and Tengen tells him two months will suffice.

Maki says that it's 9 a.m. on November 9th, and Yuta says that the sorcerer players awakened at about midnight on October 31st. Megumi asks Master Tengen that if those who refuse to participate in the Culling Game will die, and he confirms it. Megumi comes to the conclusion that Tsumiki has roughly 10 days and 15 hours until she declares her participation in the Culling Game. Maki says that Shoko was correct and adds on that people such as herself with no cursed technique won't be at risk.

Yuji wonders about the civilians already inside of the barrier, Tengen tells him that they will have one chance to exit much to Yuji's surprise, and Yuta comments on how generous that is. Tengen tells them that there isn't a rule about entering nor exiting the barrier and adds on that they believe that it's to stimulate the game. They also add on that in order to confine the players, the premise of them entering of their own free will is important. Megumi asks about the "game master", and Tengen tells them that each player will be given a shikigami called a "Kogane". They add on that a Kogane is less game master than an interface.

Yuki is confused by the sixth rule where players are allowed to negotiate with the game master to add a rule. Choso asks if the rule is fair, and Yuta confirms it is, while Maki comments on how it gives the game master a lot of leeway. Tengen tells them that the players are subjected to strict rules and sorcery wise Kenjaku is due to no further bias.

Maki tells them that's all the information they have and each will have a different role to play: Yuki and Choso will be remaining as Master Tengen's guards, Maki will head back to the Zenin family's warehouse and search for cursed tools before revealing, that soon after Gojo was sealed, both the Kamo and Zenin family went to Tokyo Jujutsu High's cursed warehouse and emptied it of weapons. She adds on that Megumi is the current family head. Considering Megumi is the current family head, it's possible to search the Zenin family's warehouse at length. She turns to Master Tengen and asks about Juzo Kumiya's warehouse.

Maki tells them that afterwards she will go look for Panda and help address the game. Yuta says that he will enter a colony immidiately before Tsumiki Fushiguro is needed to enter the game, he also wants to gain more information. He says that he will be avoiding nearby colonies so they won't end up killing each other, and also just in case something happens to Tsumiki. Yuta adds that the barriers may block phone reception so they will be out of touch for a while. Megumi turns to Maki who tells them to go to Kinji Hakari as planned. Yuta reveals that Kinji is a suspended third-year. Yuji asks if they're tough and Yuta tells him that when Kinji is worked up, he is stronger than himself, but Maki notes that it's not true.

Yuki, along with Choso and Master Tengen, remains behind and watches Yuta, Maki, Yuji, and Megumi leave. When Yuji suddenly stops and turns around to thank Choso, he tells Yuji not to die. Yuki asks Choso if he's crying, but he doesn't respond, only waving his hand.