in chapter 236 (jujutsu) you suddenly enter a strange portal that pulls you in, and suddenly you are taken to chapter 236, namely Gojo fighting with Sukuna, seen from a distance Gojo is fighting with Sukuna in fushiguro's body , and nobara, itadori, maki and yuta are killing other curses

Itadori: let's attack!!

a few hours, Gojo is really dying and his body is split in two

sukuna in fushiguro's body: very sad, isn't it? laughs cruelly