Shibuya Incident Arc

The Shibuya Incident is the eighth arc in Akutami Gege's Jujutsu Kaisen.

Investigating the Traitor
On October 19, 2018, Gojo is asleep and dreams about when he had first met Megumi and what they had discussed that day. When Yuji, Megumi, and Gojo arrive, Gojo wakes up and sends them to were Utahime is at. Once the three meet up with Utahime, she tells them about the mole in the school and how they are going to investigate Kokichi Muta.

At the Kyoto School, Miwa meets with Mechamaru about the notebook that they have to turn in. Mechamaru tells her were he had left it and that he will be going to sleep for a bit. Once Mechamaru is asleep, Miwa wonders were the real Mechamaru is at. At another location, Utahime is informing Nobara, Yuji, and Megumi about Kokichi and what he is capable of. When they reach the location that Kokichi is suppose to be at, they break in and find that Kokichi is at another location.

At the location that Kokichi is really at, Kokichi meets with Geto and Mahito. Kokichi comments about how he had thought that they had forgotten about him, which Geto replies that they would never do that since Kokichi knows the consequences of cursed restrictions. As Mahito suggest they kill Kokichi since they have the information that they need, Geto tells him that they first have to heal Kokichi before they can kill Kokichi. Kokichi tells them to just hurry up and heal him, which Mahito says to not blame him if he turns Kokichi into a caterpillar. Geto tells Mahito that they don't know what would happen if they break the vow they made with Kokichi, which Mahito agrees to heal Kokichi. Mahito then uses his Idle Transfiguration technique on Kokichi and completely heals his body. Mahito comments about how Kokichi show some enthusiasm, but Kokichi replies that that comes after they settle their business.

Battle at the Dam
Mahito prepares to fight while Kokichi brings out multiple Mechamaru puppets. Geto asks if he should help him but Mahito replies that Kokichi is his toy. As Kokichi sends his puppets at Mahito, Mahito easily destroys them all. Mahito then notices that Kokichi is gone and comments about how he wanted to fight instead of going hunting. As the floor under Mahito gives way, Mahito heads outside of the dam. Once outside, Mahito finds that he if facing a giant Mechmaru. Mahito then figures that Kokichi is piloting the puppet from its head. Inside the cockpit, Kokichi notices that a screen if blocking him from contacting Gojo. Kokichi thinks about how he will have to get in contract with Gojo. Kokichi thinks about how he will have to exorcise Mahito first and looks at Geto, which Geto says to not mind him. Kokichi then thinks about how he is currently at a disadvantage and that he can't be frugal with the cursed energy that he has saved up while also thinking about Miwa.

Kokichi fires a Ultra Cannon blast at Mahito, but Mahito heals himself and runs. As Mahito wonders what Kokichi is planning, which Kokichi thinks about how Mahito should know that Mechamaru's attack won't work on Mahito. As Kokichi attacks Mahito again, Mahito easily dodges it and turns into a fish while diving into the water. Kokichi attacks with a Miracle Cannon technique, but Mahito dodges it and grabs a hold of Mechamaru. Mahito thinks about how Kokichi doesn't care about his attacks and will be on the offensive, while Kokichi thinks about how he will use his secret weapon. As Mahito lands a blow on Mechamaru, Kokichi thinks about how Mahito will break the armor if he is not careful while loading his secret weapon. Mahito thinks about how he has to finish the fight quickly since he only has four chances with his secret weapon. Kokichi manages to blow off Mahito's arm with his secret weapon, much to Mahito's shock. Kokichi takes this chance to hit Mahito into the trees. As Mahito thinks about how that technique had destroyed his soul along with his arm, Kokichi continues his attack on Mahito. Mahito quickly makes his escape, which Kokichi notices Mahito's arm has regenerated. Kokichi figures that Mahito had kneaded his soul to make it seem that his arm has regenerated and that his secret weapon is working. As Geto watching the fight, he thinks about how Kokichi's countermeasures are working on Mahito. As Kokichi attacking with his Vision Viola technique, Mahito easily dodges the attack. As Mahito thinks about which techniques have an effect on his soul, Kokichi goes to attack Mahito. As Mahito tries to get away from Kokichi, Kokichi manages to land a blow. As Kokichi loads his secret weapon again, Kokichi thinks about how he can win this fight and join his friends.

Suddenly Mahito activates his Domain Expansion "Mahayana Prison" and says that he has won.

Fights

 * Kokichi Muta vs. Mahito