When Megumi returns to the detention center he senses the Innate Domain has been closed off, indicating the Special-Grade is gone. Only it isn’t Yuuji who meets him outside, but Sukuna. Apparently Yuuji is having trouble switching back, and Sukuna makes it even harder by ripping out Yuuji’s heart, which Yuuji needs to live but he doesn’t.
Even with a gaping chest wound, Sukuna!Yuuji is able to flick away any and all of Megumi’s attacks, and he eventually realizes Megumi is trying to get him to restore Yuuji’s heart. Megumi throws his bird and giant snake, only for Sukuna to beat him mercilessly across the town.
Sukuna ultimately doesn’t take the bait, but Megumi is finally able to get Yuuji to resurface by explaining he saved Yuuji because he couldn’t bear to watch a good person like him die, even if saving him was dangerous.
We also learn about Tsumiki, someone important to Megumi (I’m guessing his sister) who was cursed and died in the hospital as Megumi couldn’t do anything. But as soon as Yuuji snaps out of it, it isn’t long before he dies from having his heart ripped out…and that’s that.
We meet who I presume to be a high-level sorcerer or priest (or both) and three eclectic Curse buddies in Tokyo, then cut to the morgue where Gojou, Ijichi receive Ieiri, who apparently intends to thoroughly dissect Yuuji’s corpse. Finally, we’re back at Jujutsu Tech, where Megumi and Nobara quietly commiserate about the loss of their comrade.
The show is extremely intent on making it known that yes, Yuuji is dead and no he won’t be coming back. To that end, Megumi and Nobara’s second-year upperclassmen Zenin Maki, Inumaki, and Panda meet with them and inform them they’ll be participating in the Kyoto Sister School Exchange Event, basically a competition between the two Jujutsu schools.
Megumi and Nobara are happy for a distraction from their grief, and then we’re back in Tokyo where the sorcerer/priest guy is at a café talking with Curses bent on eliminating the Jujutsu sorcerers once and for all. He tells them that in order to succeed in that effort, they’ll first have to neutralize Gojou Satoru, then get on Sukuna!Yuuji’s good side.
The Curse is confused…isn’t Itadori Yuuji dead? The sorcerer/priest grins, telling him he’s not so sure. Of course he isn’t! Yuuji’s the damn main character, and this isn’t Gurren Lagann; he can’t just stay dead, especially when we’ve seen him heal bits of his body. He’ll be back; it’s just a matter of when and how. No doubt the “how” will involve coming to some kind of understanding with Sukuna.