Yuta’s post-JJK 0 story is basically this: he leaves Japan to train in Africa with Miguel, then returns later as a much stronger sorcerer in the main series.

What happened next

  • At the end of Jujutsu Kaisen 0 , Yuta is shown heading off to train abroad rather than staying at Jujutsu High full-time.
  • He spends time in Africa with Miguel, partly to train and partly to search for Black Rope.
  • When he comes back into the main story, he’s no longer just the shy rookie from the prequel; he’s one of the strongest jujutsu sorcerers in the series.

Later story role

  • In the final arc, Yuta plays a major role in the fight against Sukuna.
  • Reports about the manga’s ending say Yuta survives that battle and eventually regains his original body.
  • He also ends up serving as the acting head of the Gojo clan in the postwar status quo.

In plain English

Yuta did not disappear after JJK 0 ; he got sent abroad, trained hard, came back as a heavy hitter, and stayed important all the way through the end of the story.

TL;DR: after JJK 0 , Yuta trains in Africa, returns stronger, fights in the final war, survives, and later becomes the acting head of the Gojo clan.