Mei Mei/Synopsis

Gojo's Past Arc
Years ago, Mei Mei along with Utahime Iori are on a mission when they are trapped within a spirit's barrier. As Mei Mei and Utahime discuss what to do, Satoru Gojo, Suguru Geto and Shoko Ieiri show up and free the two from the barrier along with exorcising the spirit. After being freed from the barrier, Mei Mei asks them where the screen is, only to find out Gojo(who was in charge of it) never put it up in the fist place. After the mission is complete, Mei Mei and Utahime head back to the college.

Kyoto Goodwill Event Arc
Mei Mei watches the Kyoto Goodwill Event along with the other faculty. While watching the event, Mei Mei notices how strong Maki Zenin is and wonders why she hasn't been promoted from grade 4. Gojo fills her in on the fact that Maki's family is getting in the way of Maki's promotion. Gojo then brings up how he can't see Yuji Itadori's fight, to which Mei Mei give him a simple excuse.

When intruders invade the event, Mei Mei is told to locate where all the students are at while others go handle the intruders. After the invasion, Mei Mei attends a meeting with the other faculty, where they are informed casualties they have sustained and what was stolen. After the Kyoto Goodwill Event is finished, Mei Mei heads back to Kyoto along with the other faculty and students.

Death Painting Arc
Days later, Mei Mei checks her bank account and sees that Gojo has deposited 10 million yen into her account. Later, Mei Mei and Aoi meets with principal Yoshinobu in order to promote Maki, Panda, Yuji, Megumi and Nobara to grade 1 sorcerers. Later, Mei Mei plays a game of tabletop tennis with Aoi. As Aoi voices how he will be able to join Yuji on his mission, Mei Mei tells Aoi that the person who nominated a person can't accompany the nominee on missions much to his disappointment. After telling Aoi this, Mei Mei leaves.

Shibuya Incident Arc
On October 31, Mei Mei is with her brother Ui Ui and Yuji at Aoyama Cemetery while Satoru Gojo handles the situation at Shibuya. Suddenly Mei Mei receives a call about a curtain appearing at Meiji-Jingumae Station, Mei Mei, Ui Ui, and Yuji then head over there to check on the situation. Once they arrive at Meiji-Jingumae Station, they are informed about the situation at the station. After being informed, Mei Mei uses her power on some crows to investigate what is happening in the station. Once she gets enough information and her crows are killed, Mei Mei informed Yuji and Ui Ui what is happening in the station. When Yuji asks if Mahito is in the station, Mei Mei tells him that she doesn't know but he might be since their are mutated humans in the station. Mei Mei then tells Yuji that they will split up, which Mei Mei and Ui Ui enter through one entrance while Yuji head in through another. Once they reached their location, Mei Mei manages to protect some humans from Mahito's mutated humans. When the curtain is raised, Mei Mei decides to heads over to platform B5F with Ui Ui and wait for Yuji.

Once Yuji arrives at the location, the three head off to where the trapped people are at. Along the way Mei Mei tells Yuji that he is good enough to be a first grade sorcerer and that she hasn't seen anyone get this far without using techniques, which Yuji accepts her compliment after Ui Ui get angry at him. Once they arrive at the station the people are trapped at, they notice that there is only one person present. Mei Mei, along with Yuji and Ui Ui, then head towards Gojo's location, but stop when Yuji is suddenly contacted by Kokichi Muta. Mei Mei along with Yuji and Ui Ui listens as Kokichi explains how Gojo has been sealed, that he has been killed days before, and that he has set up a back up plans just encase he had been killed. As Kokichi explains how he had ruled out Yuji and Mei Mei are the other mole, which Mei Mei wonders why she was ruled out. Kokichi says that Mei Mei had went to Mejijingu-mae station instead of staying on standby in Shibuya. Mei Mei says that she might not be following orders, which Kokichi asks why there are cursed users following them.

Mei Mei notices that there are two of them following and asks Yuji if they are stronger than the spirit that he faced, which Yuji says that the two are stronger. Mei Mei wonders where the cursed users were hiding but says that they should continue on. Kokichi tells them that they can't since there is a screen that won't let sorcerers through ahead of them. Kokichi says that Mei Mei will have to open a path, so that Yuji can head back and head towards Gojo's location from above ground. When the cursed users suddenly show up, Mei Mei along with Yuji and Ui Ui prepare to fight them. As Mei Mei fights her enemy, she explains how her technique works and what she had done to get so strong. As the enemy surrenders, Mei Mei asks what use can he be for her but kills him when he doesn't answer her right away. Afterwards, Ui Ui tells his sister that the curtain is down, which the two continue down the tunnel.

After a while, Mei Mei and Ui Ui run into Pseudo-Geto. Mei Mei and Geto start to talk, while Mei Mei also thinks about why Geto is still alive. Mei Mei figures that this Geto is a fake but think against this when Geto summons a cursed spirit. Geto then leaves, after having Mei Mei face off against his cursed spirit. As Mei Mei faces the cursed spirit, Smallpox Deity, the spirit uses it's territorial expansion to seal Mei Mei in a coffin. The spirit also crushes Mei Mei with a large boulder, but Mei Mei is able to break the boulder before it can kill her. Mei Mei then wonders how long it has been since her life was in danger. Mei Mei manages to break free from a couple more of Smallpox Deity's attacks and manages to figure out how Smallpox Deity's attacks works. Mei Mei has Ui Ui distract Smallpox Deity long for her to attack the spirit. As Smallpox Deity attacks Mei Mei, she has one of her crows exorcise the spirit at the cost of its life. Once they are released from the spirit's domain, Mei Mie and Ui Ui prepare to face off against Geto.

Mei Mei and her brother, Ui Ui are seen in a hotel room in Kuala Lumpur, Malaysia, having escaped Geto off-panel using Ui Ui's cursed technique. While there, she calls an associate and asks them to sell off all of her Japanese assets, in view of the events that have unfolded.