In terms of strength and skill in Jujutsu Kaisen, few can really challenge Satoru Gojo. As the strongest sorcerer currently alive, he possesses not only the Limitless Cursed Technique but also the Six Eyes. Alas, even the most powerful can stumble, not necessarily by raw power but by crafty design.
In the Shibuya Incident, Kenjaku managed to seal Gojo in the Prison Realm, which drastically changed the fate of the entire Jujutsu world. Kenjaku had been planning to change the world for a very long time, and the only problem he faced was none other than Gojo.
As long as Gojo was free, Kenjaku’s plan to rework the world itself through chaos and the Culling Game could not be executed. Gojo's strength alone was enough to deter any large-scale movement by curses or rogue sorcerers.

However, Kenjaku didn’t intend to fight Gojo directly. Instead, he created the perfect scenario to seal him away without ever needing to win a fair fight. The moment came during the Shibuya Incident on October 31st. In the Shibuya District, Kenjaku and his loyal supporters launched a massive attack, and Gojo had to begrudgingly intervene to protect the civilians in the area.
The area was surrounded by special barriers, or curtains, designed to isolate the battlefield and prevent reinforcements from getting through. Thousands of innocent people were trapped inside, drawing Gojo in without hesitation.
Once Gojo entered the chaos, Kenjaku set his plan in motion. He used a cursed object called the Prison Realm in Jujutsu Kaisen. It is an ancient tool capable of sealing anything inside it, including humans, as long as certain conditions are met. In this case, the target (Gojo) needed to be within a four-meter radius of the object for one minute.

That may sound difficult, especially against someone as fast and aware as Gojo, but Kenjaku knew exactly how to make it work. The key was distraction. Gojo in Jujutsu Kaisen is not only powerful but also deeply compassionate. His desire to protect the innocent is both his strength and his vulnerability.
During the Shibuya Incident, Gojo had to fight many twisted, mutated people. They were once normal humans but had been turned into weapons. This grotesque distraction forced Gojo to divide his attention and slow his attacks, creating a rare moment of mental and emotional strain.
Kenjaku took full advantage of that. Using the body of Gojo’s former best friend, Suguru Geto, he activated the Prison Realm. Seeing Geto’s face threw Gojo off momentarily, enough for the cursed object to fulfill its condition. In that short window of time, Gojo was sealed completely, his presence erased from the battlefield in an instant. The strongest sorcerer in Jujutsu Kaisen was gone.

What followed was a major shift in Jujutsu Kaisen. Without Gojo, the Jujutsu world lost its greatest protector. The balance of power tipped in favor of Kenjaku and the cursed spirits. The sealing gave Kenjaku the freedom to start the Culling Game, a deadly tournament meant to collect cursed energy and merge humanity with Tengen.
This moment also had a deep emotional impact. For Gojo’s students, Yuji, Megumi, Nobara, and others, it meant battling without their mentor. It forced them to grow quickly and deal with challenges they were not fully prepared for.
The series shifted from an over-reliance on Gojo’s godlike strength to an emphasis on teamwork, strategy, and even personal growth in the younger generations of sorcerers.
The Aftermath in Jujutsu Kaisen

What makes this moment so effective in Jujutsu Kaisen is how it shows that intelligence and manipulation can overcome raw power. Kenjaku didn’t need to be stronger than Gojo; he just needed to outthink him. The sealing was not a victory in combat but a victory of planning, patience, and the manipulation of human emotion.
At the end of season two in the anime, Gojo remains sealed within the Prison Realm, suspended in a timeless dimension. Kenjaku’s strategy was a turning point in the story. It removed the most powerful player from the board and changed the course of Jujutsu Kaisen. It also paved the way for the start of the Culling Games.
Conclusion
In the world of Jujutsu Kaisen, where curses, sorcerers, and ancient powers clash, moments like these serve as quiet reminders that being strong isn't the only way to get by. The mix of strength, cleverness, and timing determines who wins, and Kenjaku really nailed that game.