Maki Zenin/Synopsis

History
Maki was born into the Zenin family as the older twin sister of Mai Zenin. Due to her inability to see Cursed Spirits, Maki was often seen as the bravest of the two twins. Maki wants to become stronger even with her inability to see Cursed Spirits, so she's left the Zenin family in order to hone her skills, but only after declaring she will become the head of the family someday.

Cursed Child Arc
Maki, Toge Inumaki and Panda are seen talking about their incoming fourth classmate of the first year, Yuta Okkotsu. Yuta finally arrives and introduces himself to them, but Maki seems unimpressed with him and proceeds to berate him, causing Rika to attack her and the others. Later Maki is assigned with Yuta on a mission, but are attacked by very powerful Cursed Spirits due to Suguru Geto's scheming. In great danger, Maki questioned Yuta for his purpose and encouraged him to use the power of Rika.

After that, Yuta held the injured children and Maki running to safe. Maki started to train Yuta for melee weapon after that. Panda mischievously tried to get the two together when he saw them started to get along well. Suguru Geto finally approached Yuta, insulted Maki and declared war at the college.

Right before war, Maki explained to Yuta about her lack of curse power and her motivation as a Sorcerer. Suguru then brutally wounds Maki to the point of death, and then injures Panda and Toge as well. Yuta then tried his best to heal them and manages to defeat Suguru. After the war, Yuta uncursed Rika, found him actually a talented Sorcerer and remained as a classmate with his friends.

Cursed Training Arc
A year later, Maki approaches first-years Megumi and Nobara, questioning them why are they unhappy. From an afar distance, Panda whispers to her that their classmate Yuji Itadori recently died. This shocks Maki, causing her to lash out at Panda and Toge for not telling her earlier.

Regardless of that, she requests the first-years about going to the Kyoto Goodwill Event, explaining the overall structure of the event to them. Motivated to become stronger for the sake of their fallen friend, Megumi and Nobara accept Maki's request to join the Kyoto Goodwill Event.

Later, when the principal Gakuganji came to Tokyo, Aoi Todo and Maki's twin sister, Mai Zenin were brought along as well. They provoked Megumi and Nobara, which were sent by Maki to do the grocery. While Megumi confronted with Aoi Todo, Mai started to attack Nobara. The second-years manage to intervene these fights. Mai and Maki mock each other for both their lack of talent. As Maki continues to provoke Mai, this allows Nobara to sneak attack the latter. Afterwards, Maki explains to Nobara about her family situation. Nobara then grows to admire Maki for remaining strong even though the latter's family had disowned her.

Kyoto Goodwill Event Arc
When the team from Kyoto Prefectural Curse Technical College arrived, Maki teased about Nobara's eagerness of travelling to Kyoto. She and Panda also commented about Satoru's habit of being late.

After Yuji was back with the students, the first and second graders held a conference about the team battle. The second graders asked about the skills of Yuji, and Maki asked him to confront with Aoi Todo.

When the Event starts, Maki travels with the other Tokyo students. When they encounter Aoi, Maki splits from the group with Megumi. After splitting up, Maki talks with the others about how the Kyoto students are trying to kill Yuji. Maki and Megumi then head back and encounter Noritoshi Kamo and Kasumi Miwa. Maki takes on Miwa, but asks why Miwa wants to fight alone. Miwa tells her why she wants to take on Maki allow, which Maki tells her that she won't hold back. As Maki takes on Miwa, Miwa notices that Maki is stronger then want she was told by Maki's twin sister Mai. When Miwa trying to counter Maki's assault, Maki easily distracts Miwa and manages to get close to Miwa. Maki throws Miwa, while also taking her sword. Maki then leaves while taking Miwa's sword with her.

Maki encounters her sister Mai, and the two start to fight. Maki easily counters all of Mai's shots and close the distance between the two. Once Mai fires all six shots from her revolver, Maki charges at Mai. Maki plans to make sure that Mai can't reload, but is shocked when Mai fires a seventh shot. Maki manages to catch the bullet and win against Mai. Mai asks why Maki left, which Maki says that she already knows. Mai explains how she would be fine to serve the Zenin clan as a servant if Maki was with her, which Maki replies that she would have hated herself if she did that. Maki then apologizes to Mai and leaves.

When intruders invade the site of the event, Maki notices that a screen is being placed over the site they are at. Maki then takes on Hanami along with Megumi, after Toge and Noritoshi are defeated. Maki takes on Hanami with a three section staff and manages to send Hanami flying.

Maki continues to attack Hanami with Megumi's assistant but is forced to fight Hanami alone when Hanami places a cursed energy feeding seed onto Megumi. When Hanami manages to catch Maki, Maki stops Megumi from attack since they will be switching out. Suddenly Aoi and Yuji show up and rescue the two. Maki is then taken out of the screen along with Megumi, by Panda.

After the intruders have been dealt with, Maki attends a meeting where they all agree with continuing the event. Maki then play a game of baseball with the others, where she pitches for her team. When Aoi is up to bat, Maki beans him and is complimented for it.

Death Painting Arc
After the Kyoto Goodwill Event, Maki is nominated by Mei Mei for a promotion to 1st Grade Sorcerer.

Shibuya Incident Arc
On October 31, Maki is with Noabito and Nobara at Shibuya Mark City Restaurant Avenue Entrance when they meet up with Akari. Maki then listens as Akari informs them about the situation and how they will be on standby for now. Later when the citizens are attacked by mutated humans, Maki along with Nobara and Naobito head into the curtain to save the people. While dealing with the mutated humans, Maki is informed that something has happened to Kiyotaka. Maki thinks about how something feels off, and tells Nobara to take Akari to Kiyotaka's location since the assistance directors are critical and that she will deal with the mutated humans.

Maki and Naobito would meet up with Nanami, and then three head to the Shibuya Station. Along the way, Naobito tries to get Maki to leave, but Maki turns the table and says that Naobito has been drinking. When the three encounter a Cursed Spirit, Maki watches as Naobito takes on the spirit. When the Cursed Spirit, Dagon, releases a torrent of water, Maki manages to get above the water and thinks about how she would have been a goner if she didn't save herself. After Naobito manages to distract Dagon, Maki and Nanami join in the fight. Dagon manages to defend itself from the three, which Maki thinks about how humiliating it was to be saved by Naobito during the clash. When Naobito comments about how Dagon is defending itself, Maki joins in as the three overwhelm Dagon with speed based attacks and force Dagon to retreat.

Maki along with Naobito and Nanami are suddenly trapped within Dagon's Domain Expansion, which Maki is instantly hit by Dagon Domain's sure-hit technique. After figuring out what to do with each, Dagon uses his Death Swarm attack which Nanami advises Maki on how to survive the attack. After Naobito and Nanami are dealt with, Dagon attack Maki while calling her weak. Maki quickly returns and tells Dagon that he should have killed her with one attack if he is calling her weak. Dagon says that he will deal with Maki that same as the other two, which Maki thinks about how she should have gotten Roaming Cloud from Megumi before coming here. Suddenly Megumi breaks into the territory and gives Maki the Roaming Cloud Cursed Tool. Maki then uses the tool to fight Dagon and manages to wound it. Maki continues to fight Dagon with Naobito, but retreat when Megumi creates an exit. Maki makes it to the portal but is surprised when Toji comes through it.

Toji takes Roaming Cloud from her, which Maki wonders about the strength that Toji has. As Maki watches Toji fight against Dagon, Maki wonder just who Toji is which Naobito says that Toji is just a ghost. Maki is then shocked when Toji sharpens Roaming Cloud. When Toji exorcises Dagon, Maki thinks about how Toji was able to take care of Dagon by himself.

Distracted by Toji suddenly grabbing Megumi and fleeing through a window, she fails to notice the arrival of Jogo, who mourns his fallen comrade. Maki watches as the vengeful spirit turns to them, effortlessly advancing on Nanami and engulfing him in a blast of fire from his palm. Before she can even finish calling out for Nanami, Jogo moves towards Maki and immolates her from the chest up with a flick of the wrist, causing her to fall unconscious.

Itadori's Extermination Arc
Maki is eventually rescued after her events in Shibuya, but is in critical condition according to the Zenin Family.