Chapter 0-4

Bright Darkness (しい) is the final chapter of Gege Akutami's Jujutsu Kaisen 0: Jujutsu High.

Summary
Yuta & Rika vs. Suguru Geto the final battle! Yuta goes all out against Geto and his army of Cursed Spirits. In order to save his friends, Yuta promises his soul to Rika and removes the limits on her power. He is able to defeat Geto, who flees and is caught by Gojo afterward. Once Yuta recovers, he prepares to say goodbye to his friends. However, the curse is lifted from Rika and her soul is finally laid to rest.

Plot Details
Yuta and Rika begin their battle with the Curse User Suguru Geto. Geto begins the battle using lots of weaker curses and is curious how Rika will respond. Rika is able to transport Maki, Toge, and Panda to a safe space where Yuta uses a Reverse Cursed Technique to heal them. Rika becomes angry with Maki, but a very stern Yuta tells her to be careful, officially controlling Rika for the first time.

After healing his friends, Yuta confronts Geto and manages to copy Toge's Cursed Speech. He commands all Geto's Cursed Spirits to die, impressing the Curse User. Yuta mentions how difficult using Cursed Speech is and commends Toge but Geto is surprised to see Yuta using such high-level Jujutsu. He surmises that Rika is truly a boundless river of Cursed Energy that can be shaped into any technique. Meanwhile in Shinjuku, Gojo and Ijichi deal with the Cursed Sorcerers Miguel, Nanamko, and Mimiko. The two girls hang several Assistant Managers and threaten to do so to anyone who gets in Geto's way. Miguel is able to disturb Gojo's Cursed Technique thanks to a rope weaved with an uncanny curse. The rope is running out and Miguel still has to stall Gojo for more time.

Back at Jujutsu High, Geto arms himself with Cursed Tools and prepares to fight Yuta directly. He believes Rika must be overflowing with Cursed Energy, granting Yuta enhanced abilities in every sense. Geto compares Jujutsu Sorcerers to gods, further irritating Yuta who continues their battle by striking several times with his sword. Geto is able to parry with a three-section staff and claims that normal humans are just trying to ignore those above them. Yuta claims he's done with Geto's god-complex but gets caught off guard

An octopus-like curse entangles Yuta and before he can cut himself free, Geto strikes him several times. Rika brings Yuta out of harm's way and Geto continues to monologue. Geto believes that the audacity of non-sorcerers to hide away the strong makes him sick. Rika checks on Yuta's condition, but he claims to have gotten used to Geto's movements. Yuta re-engages his opponent but his sword breaks from all the Cursed Energy running through it. Geto tries to tease him about this, but Yuta smashes his face and sends him flying back with a left hook.

Yuta admits he can confirm whether Geto is right or not, but simply because this man threatens Yuta's friends, means he has to go down. Geto summons his most powerful Cursed Spirits in a single technique, threatening to destroy Yuta once and for all. In response, Yuta thanks Rika for protecting him and embraces her. He asks for her power one last time and promises that they'll be together forever after that. This excites Rika's spirit, which grows even stronger.

Geto realizes that Yuta is sacrificing himself to remove any limits on his Cursed Energy. Using love, the most powerful curse of all, Rika fires a blast of Cursed Energy that clashes with Geto's Cursed Spirits, creating a massive explosion. Geto flees the scene, severely injured and missing an arm. He swears to get Rika next time but he's confronted by Gojo. Gojo confirms all of Geto's followers fled and admits that he trusted Geto enough not to injure young Sorcerers like Panda and Toge. He gives Geto a chance for last words and the Curse User admits he harbors no disdain for Jujutsu High.

Maki, Toge, and Panda awaken Yuta, who's glad to see they're okay. However, Rika calls Yuta and he plans on making good on his promise to her. Suddenly, Rika's cursed form shatters, revealing the human spirit of a young Rika. Gojo arrives and confirms that the curse has been lifted. He also reveals that Yuta is a relative of one of the Sorcerer clans and his rejection of her death led to her manifestation as a Cursed Spirit.

Yuta begins to cry because he feels responsible for everything that's happened, but Rika embraces him and reveals that she's been happier than ever. Her Spirit disappears after saying goodbye to Yuta and she is finally laid to rest.

Sometime afterward on a day when it's snowing, Gojo walks with Yuta, assuring him that everything that happened with Geto was his fault. He also returns the student ID that Geto took from him. Maki interrupts, standing in front of the duo with Toge and Panda. Happy to see his friends, Yuta smiles, still wearing the ring Rika gave him.

Locations

 * Tokyo Jujutsu High

Battles & Events

 * Yuta Okkotsu vs. Suguru Geto (Concluded)

Jujutsu
Suguru Geto's Techniques Yuta Okkotsu's Techniques
 * Cursed Spirit Manipulation
 * Maximum Uzumaki
 * Reverse Cursed Technique
 * Cursed Speech