Rather than escape Dagon’s beach domain through Megumi’s hole, Touji enters and joins the party. Only he’s not quite himself; the Old Lady’s technique was left on after she was killed, so he’s in a continuous state of murderous frenzy, drawn like a guided missile to the strongest one in range—in this case, Dagon. He “borrows” Maki’s staff then gets to work.
It’s a pretty fun (and very wet) battle, but we all knew it would end with Dagon gone and the beach domain with him, and what seemed like a temporarily alliance would break down. After all, this version of Touji likely wouldn’t join forces with the Zenins if he was in his right mind. He isn’t, and his next target is Megumi, apparently the next-strongest.
Just because he tosses Megumi out onto the street and joins him there doesn’t meant Nanami, Maki, and Naobito are in any better a way. In fact, this just isn’t their arc. Were it not for Touji, Dagon would have killed them all. But now that Dagon is dead, Jougo shows up to mourn his comrade’s death, then burns Nanami, Maki, and Naobito to a crisp. Then he senses Sukuna, or rather one of his fingers. Sure enough, Nanako and Mimiko are feeding one to an unconscious Yuuji.
Jougo shows up in a hurry and burns the girls, but they survive thanks to Nanako’s cameraphone. Jougo feeds Yuuji ten more fingers, so Sukuna can be temporarily awakened while Yuuji’s body takes time to repress him. It works, and Sukuna’s first act is to cut Jougo’s arm off then slice off the top of his head for not bowing low enough before him.
The Nanaba sisters raise their heads when ordered to and make their case: if Sukuna kills the fake Getou, they’ll give him another finger. This displeases him, and he beheads Mimiko in an instant. When Nanako screams in anguish, and prepares to attack him with her phone, he slices the top half of her head off, then cuts her into a gory fine dice.
RIP Nanako and Mimiko, trapped between allowing the fake Getou to continue desecrating the man they loved, and having to ask Sukuna for help. I guess they figured it was better to at least try with Sukuna. He wasn’t interested in helping them, but he tells Jougo he’ll fight for the cursed spirits if Jougo can score one hit on him. Like the sisters, Jougo prepares to go for it, because what the hell else is he going to do?