Rika Orimoto/Synopsis

History
In 2011, Rika is in a park with Yuta when she gives him a birthday gift. The gift is a ring and the two promise to marry each other when they grow up. Rika is later killed in a car accident. Yuta then curses Rika, and caused her to be attached to him and become a vengeful spirit.

Cursed Child Arc
In November of 2016, Rika had stuffed four students in a locker that were bullying Yuta. After this event, Yuta was taken to Tokyo Jujutsu High. During his isolating, Yuta tried to kill himself but Rika got in the way and saved him. It was during this time that it was decided that Yuta would enroll into the college in order to exorcise Rika one day. When Yuta met his fellow classmates, they notice Rika and confront him. Rika shows up and forces the three to back away from Yuta and punches them on their heads. Once the three settle down, Gojo explains the situation that is happening with Yuta.

Yuta is then given a mission with Maki, where they have to exorcise a spirit that had kidnapped some kids at a school. When Yuta and Maki are swallowed by the spirit that had kidnapped the children, Yuta summons Rika to exorcise the spirit while Yuta brings Maki and the children to safety. Rika emerges from the spirit's belly and was asked by the creature who was she to which Rika smashed his face and tells him to shut up. She then proceeds to tear open the spirit's stomach to look for blue colour after being delighted to see blood(red colour) in her hand. After this mission is completed, Gojo informs his superiors of what they know about Rika.

Days later, Yuta is sent on a mission with Toge and told to not let Rika out during the mission. During the mission, a powerful spirit appears and becomes angry when it senses Rika.

On December 24, Geto comes to the college in order to kill Yuta and add Rika to his collection. When Yuta finds out that Geto has harmed his friends, Yuta fully summons Rika. Yuta and Rika then fight against Geto and all the cursed spirits that he has collected. While fighting, Rika manages to collect all of Yuta's friends and the two get them to a safe location. As Yuta starts to heal his friends, Rika get jealous of Maki and grabs her. Yuta tells her to let Maki go, which Rika releases Maki and apologizes for what she has done. Yuta then points out that Geto is their enemy, which Rika says that she hated Geto too.

Rika and Geto then continue their fight with Geto, which Yuta uses Rika's power (summoning a megaphone with the Inumaki's curse speech seal on it)to easily destroy Geto's cursed spirits. Geto manages to figure what Rika's abilities are and desires Rika even more. Rika and Geto then went in a close combat fight, which Geto manages to overwhelm Yuta. Rika sees that Yuta is being overwhelmed and quickly brings Yuta away from Geto. Yuta manages to get used to Geto fighting style, Yuta manages to push Geto into a corner. When Geto decides to throw all his spirits at Yuta, Yuta then thanks Rika for always helping him. Rika then gets excited when Yuta kisses her causing her to open one eye, which Geto notices that Yuta is planning to sacrifice himself to remove the limits on Rika. Rika then fires a blast, that manages to defeat Geto and his spirits.

When Yuta falls unconscious, Rika waits until Yuta wakes up. Maki, Toge, and Panda show up when Yuta wakes up. Yuta informs that in order to defeat Geto, he had to sacrifice himself to release Rika's powers. As Yuta prepares to join Rika, Rika suddenly returns to her appearance when she was still alive. As they are all confused by this, Gojo shows up and informs them that Rika's curse has now dispelled. Gojo explains how it was Yuta that had cursed Rika when she died, because he could not accept her death. As Yuta starts to blame himself for everyone that was hurt by Rika, she hugs Yuta and explains how she was truly happy being by Yuta's side for the past 6 years and thanks Yuta for helping her be with her all these years. Rika then bids Yuta goodbye and disappears to the afterlife.